Soil Science Commons^™

Forages Improve Livelihoods Of Smallholder Farmers With Beef Cattle In South Central Coastal Vietnam, Ba Xuan Nguyen, Peter A. Lane, David Parsons, Huu Van Nguyen, Phi Khanh Ho Le, Jeff P. Corfield, Tri Tuan Duong

IGC Proceedings (1977-2023)

In South Central Coastal Vietnam, on-farm research and farmer experience demonstrated the benefits of growing improved forages as a means of improving the year round quantity and quality of feed available for beef cattle. In Binh Dinh, Phu Yen and Ninh Thuan provinces, five new forage species (Panicum maximum, cv. TD58, Brachiaria hybrid cv. Mulato II, Pennisetum purpureum cv.VA06, Paspalum atratum cv. Terenos and Stylosanthes guianensis cv. CIAT 184) were evaluated for yield and crude protein concentration. There was not a consistent yield difference between locations for the forage grasses, but in Binh Dinh province P. maximum TD58 …

Influence Of Cutting Interval On Yield And Quality Of Purple Guinea Grass (Panicum Maximum Td58) Under Irrigation, Witthaya Sumamal, Pornchai Lowilai

IGC Proceedings (1977-2023)

Most of dairy farmers in the northeast of Thailand are smallholders. They have limited pasture area led to lack of good quality roughage throughout the year, especially during the dry season. Farmers usually fed their cattle with agricultural by products, which have low quality and supplemented with commercial concentrate feed. It leads to high milk production cost and more problems of cattle performance. It is necessary to develop and improve the feed quality and quantity, especially pasture, the cheapest and major source of cattle feed. Due to the limited pasture area, intensive pasture system is recommended. They need a suitable …

Forage Legumes Intercropping And Nitrogen Management Effects On Performance Of Guinea Grass (Panicum Maximum) Varieties In Bundelkhand Region Of India, Mukesh Choudhary, G. Prabhu

IGC Proceedings (1977-2023)

Guinea grass (Panicum maximum Jacq.) is one of the important forage grass of the tropics with good yield potential, palatability, persistence and quality fodder (Sukhchain, 2010). The low crude protein productivity of guinea grass can be enhanced through its intercropping with forage legumes to sustain ruminant animals throughout the year. The intercropping of legumes with guinea grass will also optimize forage production per unit area, especially during rabi season. Further, its productivity can also be increased through N management as it is heavy feeder due to perennial and multi-cut nature.

Endophytes For Improving Ryegrass Performance: Current Status And Future Possibilities, Alison J. Popay, David E. Hume

IGC Proceedings (1977-2023)

The endophyte N. lolii was introduced naturally into New Zealand and Australia when perennial ryegrass seed was brought into these countries. Although the presence of the endophyte was recognised early in the 19^th Century, its effects were only discovered in the early 1980s when it was found that these Wild-type strains of endophyte caused ryegrass staggers, a neuromuscular condition of grazing animals (Fletcher and Harvey 1981), and that they also protected their hosts from the effects of Argentine stem weevil (Listronotus bonariensis) a serious pest of ryegrass in New Zealand (Prestidge et al. 1982). These endophytes …

Studies On Insect Fauna Of Lucerne Medicago Sativa And Their Impact On Seed And Forage Yield In Lucerne Medicago Sativa , Narendra S. Kulkarni, Vinod Kumar

IGC Proceedings (1977-2023)

Lucerne or Alfalfa (Medicago sativa L) is the world’s most important forage legume and a key component of many crop rotation systems (Osborn et. al., 1997). Alfalfa is considered an insectary due to the large number of insects it attracts. Some pests, such as alfalfa weevil, aphids, armyworms, and the potato leafhopper, can reduce alfalfa yields dramatically, particularly with the second cutting when weather is warmest. Chemical controls are sometimes used to prevent this. As a perennial crop, lucerne has a lifespan approaching 5 years, but in some areas of the world fields may remain productive for considerably longer. …

Effect Of Forage Brassica On Subsequent Soil Water Content And Yield Of Dual-Purpose Winter Wheat In Rainfed Region Of Northwestern China, Yuanbo Liu, Lihua Tian, Qingping Zhang, Yuying Shen

IGC Proceedings (1977-2023)

The dual-purpose performance of winter wheat used for both forage and grain production has been explored as an alternative practice for filling the feed gap during winter and spring in agricultural areas of the Loess Plateau. Profit-ability is still restricted however, because of a three month summer fallow period between harvest and planting of the subsequent wheat crop. During this 3 month period 60% of the annual precipitation occurs, limiting the effective use of soil water and compounding the risk of soil erosion. Thus it is important to cultivate some forage crops with higher water consumption, protecting the ecological environment …

World Interest In Diverse Native Plant Stands, Michael P. Schellenberg, Bili Biligetu, Eric G. Lamb, Jenalee M. Mischkolz

IGC Proceedings (1977-2023)

The objective of this paper was to provide a brief overview of native plant use and development including examples of native plant research being conducted in Canada. There is increasing interest in native plants in various countries. Currently, native plants are used in reclamation, biomass biofuel production, forage seeding, habitat restoration, and water and soil conservation efforts. Many countries have active programs for native plant preservation and new germplasm development, but seed cost, seed quality, and ease of establishment are still challenges for large-scale use. Many improved native plant germplasms have been released in recent years. In some countries, legislation …

Physiological Characterization Of Cut-To-Cut Yield Variations Of Alfalfa Genotypes Under Controlled Greenhouse Conditions, Defeng Li, Baoluo Ma, Chengzhang Wang, Pufang Li

IGC Proceedings (1977-2023)

In a temperate region, alfalfa (Medicago sativa) crops are usually harvested 3-6 times per annum. The biomass yields of first and second cuts in the spring are generally the high-est. However, in subsequent cuts the biomass yields decline, with the final 1 or 2 cuts producing the lowest yields (Wang et al. 2009). This seasonal reduction in alfalfa biomass yields could be associated with prevailing changes in environmental factors such as rainfall and heat stress or due to biological characteristics of alfalfa crop itself. In this study, alfalfa was grown under controlled greenhouse conditions with suitable temperature, …

Dry Matter Yield Of Perennial Ryegrass Cultivars Under Mechanical Cutting And Animal Grazing, Patrick A. Cashman, Trevor J. Gilliland, Michael O’Donovan, Marion Beecher, Mary Mcevoy

IGC Proceedings (1977-2023)

Perennial ryegrass evaluation trials are essential to identifying and promoting the most productive cultivars for use at farm level to maximise sward productivity (Grogan and Gilliland 2011). Cultivar testing is predominantly conducted under simulated grazing trials to predict dry matter yield (DMY) performance under animal grazing. Previous studies have shown a high correlation in DMY between these two defoliation methods (Camlin and Stewart 1975; Creighton et al. 2010). In contrast, Binnie and Chestnutt (1991) demonstrated that swards grazed by animals had higher DMY performance than those exposed to simulated grazing managements. Animal pressures such as pulling, treading and nutrient …

Fodder Yield And Quality Of Lucerne (Medicago Sativa) Grown As Pure Stands And In Mixture With Oats (Avena Sativa), Mustard (Brassica Campestris) And Ryegrass (Lolium Perenne) Under Different Cutting Managements, Balwinder Kumar, U. S. Tiwana, Ajaib Singh

IGC Proceedings (1977-2023)

Legume-cereal mixtures are important protein and carbohydrate sources for livestock and provide a balanced chemical composition for livestock feeding along with higher green forage yields than the pure stands (Berdahl et al. 2001; Albayrak and Ekiz, 2005). Lucerne is the most important rabi legume crop of Punjab grown under limited irrigation conditions and provides succulent, palatable and nutritious fodder to dairy animals. The fodder yield of first cut of lucerne is very low so it is usually grown in mixture with oats and or mustard. The information on the mixtures of lucerne and suitable cutting times is scant. This …

Effect Of Cutting Interval On Yield And Quality Of Two Panicum Maximum Cultivars In Thailand, Michael D. Hare, Supaphan Phengphet, Theerachai Songsiri, Naddakorn Sutin, Eduardo Stern

IGC Proceedings (1977-2023)

Tanzania guinea grass [Panicum maximum cv. Tanzania (cv. Purple in Thailand)] has been grown in Thailand for over 20 years and has proven to be a high quality forage (Phaikaew et al. 2007). Mombasa guinea grass (Panicum maximum cv. Mombasa) was introduced to Thailand in 2007 and commercial seed production commenced in 2008 because of a demand for seed in central and South America (Hare et al. 2013). It is a larger and taller cultivar than Tanzania. A series of studies have been undertaken at Ubon Ratchathani University, Thailand, to study the agronomic differences between these …

Response Of Axonopus Catarinensis And Arachis Pintoi To Shade Conditions, A. N. A. Pachas, E. J. Jacobo, M. C. Goldfarb, S. M. Lacorte

IGC Proceedings (1977-2023)

In the north-east of Argentina, there are more than 100,000 hectares of silvopastoral systems where trees, forages and livestock are combined with the goal to diversify income, reduce financial risk, obtain more profit and enhance environmental benefit (Cubbage et al. 2013). The rapid adoption of this production system by farmers has generated high demand for information on shade tolerant grass and legume forage species.

Axonopus catarinensis is a native grass from Itajai Vally (Brazil) that was introduced to the north-east of Argentina 10 years ago; whereas Arachis pintoi is a sub-tropical legume (also native to Brazil) adapted to acid …

The Effect Of Preflood Nitrogen And Flood Establishment Timing On Rice Development, Nitrogen Uptake And Grain Yield, Tyler Richmond

Graduate Theses and Dissertations

Urea-N fertilizer is typically applied at the 5-leaf stage to rice (Oryza sativa L.) grown in a dry-seeded, delayed-flood production system. How long the preflood-N can be delayed without adverse effects on yield potential is poorly understood. The research objective was to determine the effects of preflood-N application and flood establishment timing on aboveground-N content, 50% heading, yield components, and grain yield. Trials were established on silt loam soils at the Pine Tree Research Station (PTRS) and Rice Research and Extension Center (RREC) during 2015 and 2016. Urea-N was applied at 0, 45, 90, 135, and 180 kg N ha-1 …

Reductions Of Wheat Yield And Yield Components And Nitrogen Loss Following Frozen Soil Nitrogen Applications, Carrie Ann Knott, Edwin L. Ritchey, Lloyd W. Murdock

Plant and Soil Sciences Research Report

Most wheat producers in Kentucky apply nitrogen (N) as a split application. The first N increment is applied when wheat plants begin actively growing (green-up) in late winter, which is typically in mid- February between growth stages Feekes 2 to 3. The second N increment typically occurs in March when wheat is between Feekes 5 to 6. Many producers in Kentucky, especially Western Kentucky, have become accustomed to beginning first N applications in late January when the ground is frozen and the wheat is still dormant. This practice allows them to apply N to large acreages of wheat while avoiding …

Genomic Approaches For Dissecting Complex Traits Related To Quality Production Of Range Grasses, Masumi Ebina

IGC Proceedings (1977-2023)

Tropical grasses have been widely used as warm-season forage grasses in the warm temperate zone since the early 20th century because of their high yields; they have also been used as perennial forages in their native tropical areas. Increasing demand for animal production sparked by economic development in tropical countries is requiring breeders to improve native forage grasses in these countries. Considerable efforts have been made to breed accessions with improved characteristics and to develop new cultivars. However, cross-breeding is not common, owing to a lack of genetic information and to complexities related to polyploidy, high sterility rates, outcrossing, and …

Tillage And Subsoiling Effects On Soil Compaction And Yield Of Burley Tobacco, Edwin L. Ritchey, Robert C. Pearce, John H. Grove

Plant and Soil Sciences Research Report

Historically, tobacco producers have relied heavily on surface tillage to prepare fields for transplanting. This typically involved moldboard plowing, followed by several secondary tillage operations, such as discing then leveling with a soil finisher. Transplanter developments and modifications in the late 1990’s, coupled with new chemicals for weed control, made no-till (NT) tobacco a viable option for tobacco producers in Kentucky (KY).

Crop Updates 2011 - Farming Systems, Janette Drew, Rob Grima, Bob French, Raj Malik, Mark Seymour, Christine Zaicou-Kunesch, Glenn Mcdonald, Brendon Nicholas, Dennis Van Gool, James Fisher, Peter Tozer, Doug Abrecht, Michael Robertson, Cameron Weeks, Michael O'Conner, Peter Newman, Mike Clarke, Andrew Blake, Gordon Macaulay, Vijay Jayasena, Syed M. Nasar-Abbas, Larisa Cato, Robert Loughman, Ken Quail

Crop Updates

This session covers twelve papers from different authors:

1. Fallowing 50% of the farm each year – does it pay? Janette Drew and Rob Grima

Department of Agriculture and Food

2. How crop sequences affect the productivity and resilience of cropping systems in two Western Australian environments, Bob French, Raj Malik, Mark Seymour, Department of Agriculture and Food

3. When is continuous wheat or barley sustainable? Christine Zaicou-Kunesch and Rob Grima Department of Agriculture and Food

4. Identifying constraints to bridging the yield gap, Glenn McDonald, Department of Agriculture and Food

5. Land constraints limiting wheat yields in …

Crop Updates 2011 - Cereals, David Bowran, Bill Crabtree, Peter Carberry, Peter Burges, Bevan Buirchell, Ben Curtis, Sarah Ellis, Brenda Shackley, Christine Zaicou, Siva Sivapalan, Penny Goldsmith, Gae Plunkett, Darshan Sharma, Mario D'Antuono, Art Diggle, Peter Mangano, Sally Peltzer, Michael Renton, Bill Macleod, Fumie Horiuchi, George Wyatt, Geoff Anderson, Richard Bell, Ross Brennan, Wen Chen, Penny Riffkin

Crop Updates

This session covers eleven papers from different authors:

OPENING, NEW CROP VARIETIES & DECISION SUPPORT

Opening

1. Overview of the 2010 season, David Bowran, Director, Practice and Systems Innovation, Department of Agriculture and Food,

2. My experience in a drought as a farmer and consultant, Bill Crabtree, Morawa, Western Australia

3. Meeting the productivity and sustainability challenges to Australian agriculture until 2030, Peter Carberry, CSIRO Sustainable Agriculture Flagship

New Crop Varieties

4. National Variety Trials (NTV) wheat variety performance – captivity vs broadacre, Peter Burgess, Kalyx Agriculture

5. WALAN2289 – a new lupin variety to replace …

Crop Updates 2009 - Farming Systems, Derk Bakker, Grey Poulish, Steve Lacy, Svetlana Micic, Peter Mangano, Tony Dore, Alan Lord, Vivien Vanstone, Helen Hunter, Sean Kelly, W. K. Anderson, Gary Lang, David Mccarthy, Ruhi Ferdowsian, Ian Rose, Andrew Van Burgel, David Ferris, Rob Grima, Natalie Hogg, John Davis, Jarrad Martin, Pippa Michael, Robert Belford, Kawsar P. Salam, Roy Murray-Prior, David Bowran, Moin U. Salam, Tim Scanlon, Len Wade, Megan Ryan, Megan Abrahams, Chad Reynolds, Caroline Peek, Dennis Van Gool, Kari-Lee Falconer, Daniel Gardiner, Geoff Anderson, Siva Sivapalan, Tim Mcclelland, James Hunt, Zvi Hochman, Bill Long, Dean Holzworth, Anthony Whitbread, Stephen Van Rees, Peter Devoil, Yvette Oliver, Michael Robertson, Peter Stone

Crop Updates

This session covers nineteen papers from different authors:

Decision support technology

1. The use of high resolution imagery in broad acre cropping, Derk Bakker and Grey Poulish, Department of Agriculture and Food

2. Spraywise decisions – online spray applicatiors planning tool, Steve Lacy, Nufarm Australia Ltd

3. Testing for redlegged earthmite resistance in Western Australia, Svetlana Micic, Peter Mangano, Tony Dore and Alan Lord, Department of Agriculture and Food

4. Screening cereal, canola and pasture cultivars for Root Lesion Nematode (Pratylenchus neglectus), Vivien Vanstone, Helen Hunter and Sean Kelly,Department of Agriculture and Food

Farming Systems Research

5. …

Crop Updates 2006 - Farming Systems, Wayne Pluske, Bill Bowden, Craig Scanlan, Stephen Davies, Chris Gazey, Peter Tozer, Derk Bakker, Louise Barton, David Gatter, Renee Buck, Daniel Murphy, Christoph Hinz, Bill Porter, Meredith Fairbanks, Nicolyn Short, Ian Foster, James Fisher, Doug Abrecht, Mario D'Antuono, Tracey M. Gianatti, Paul Carmody, Frank D'Amden, Rick Llewellyn, Michael Burton, Caroline Peek, Nadine Eva, Chris Carter, Megan Abrahams, Andrew Blake, Paul Blackwell, Sylvian Pottier, Michael Robertson, Greg Lyle, Lisa Brennan, Tony J. Vyn, Simon Teakle, Peter Norris, Jeff Russell, James Fisher, Roy Murray-Prior, Deb Pritchard, Mike Collins, Greg Hamilton, Rob Hetherington, Andrew Van Burgel, Cliff Spann

Crop Updates

This session covers nineteen papers from different authors:

SOIL AND NUTRIENT MANAGEMENT

1. Inve$tigating fertili$er inve$tment, Wayne Pluske, Nutrient Management Systems

2. KASM, the potassium in Agricultural System Model,Bill Bowden and Craig Scanlan, DAWA Northam and UWA, School of Earth and Geographical Sciences

3. Long term productivity and economic benefits of subsurface acidity management from surface and subsurface liming, Stephen Davies, Chris Gazey and Peter Tozer, Department of Agriculture

4. Furrow and ridges to prevent waterlogging, Dr Derk Bakker, Department of Agriculture

5. Nitrous oxide emissions from a cropped soil in Western Australia, Louise Barton^{1 …}

Crop Updates 2002 - Farming Systems, Peter Metcalfe, Mike Ewing, Roy Latta, Keith Devenish, Diana Fedorenko, Clayton Butterly, Chantelle Butterly, Kim Diamond, Neil Diamond, Stuart Mcalpine, Bill Bowden, Jessica Johns, Terry Piper, David Bowran, Robert Beard, Phil Ward, Dominie Wright, Nichole Burges, Roger Jones, Danae Harman, Greg Shea, George Yan, David Tennant, David Hall, Anyou Liu, Clinton Revell, Candy Hudson, Andrew Blake, Natalie Lauritsen, John Fosu-Nyarko, Roger Jones, Lisa Smith, Mike Jones, Geoff Dwyer, Bill Bowden, Michael O'Connell, Chris Gazey, David Gartner, Amanda Miller, Richard W. Bell, K. Frost, Mike Wong, Ross Brennan, N. J. Blake, G. Mconnell, D. Patabendige, N. Venn, Derk Bakker, Greg Hamilton, Dave Houlbrooke, Cliff Spann, Paul Blackwell, Bindi Webb, G. Lyle, K. Wittwer, Perry Dolling, Senthold Asseng, Ian Fillery, Michael Robertson, Caroline Peek, David Rogers, Peter Portman, Jeff Russell, Greg Shea, Ben Henderson, Ross Kingwell, Tresslyn Walmsley, Jean Galloway, Debbie Thackray, Moin Salam, Art Diggle, William J. Macleod, Jenny Hawkes

Crop Updates

This session covers forty one papers from different authors:

INTRODUCTION

1. Future Farming Systems session for Crop Updates 2002 Peter Metcalf, FARMING SYSTEMS SUBPROGRAM MANAGER GRAINS PROGRAM Department of Agriculture

2. Perennial pastures in annual cropping systems: Lucerne and beyond, the ‘Big Picture’, Mike Ewing, Deputy CEO CRC for Plant-based Management of Dryland Salinity, Department of Agriculture

3. Perennial pastures in annual cropping systems: lucerne and beyond, Roy Latta and Keith Devenish, Department of Agriculture

4. Establishing Lucerne with a cover crop, Diana Fedorenko¹, Clayton Butterly¹, Chantelle Butterly¹, Kim and Neil Diamond^{2 …}

Crop Updates 2000 - Oilseeds, Paul Carmody, Ping Si, Rodney Mailer, Nick Galwey, David Turner, Kevin Morthorpe, Stephen Addenbrooke, Peter Nelson, Mike Jackson, Scott Paton, Ross Brennan, Noeleen Edwards, Mike Bolland, Bill Bowden, C. P. Gunasekera, L. D. Martin, G. H. Walton, K. H. M. Siddique, Sharon R. Niknam, David W. Turner, Abul Hashem, Harmonhinder Dhammu, David Bowran, The Canola Association Of Western Australia, Syed H. Zaheer, Ravjit Khangura, Martin J. Barbetti, Peter Carlton, Debbie Thackray, Jenny Hawkes, Roger Jones, Brenda Coutts, Françoise Berlandier, Ross Kingwell, Michael O'Connell, Simone Bennerhasset

Crop Updates

This session covers seventeen papers from different authors:

Introduction, Paul Carmody, Centre for Cropping Systems

CANOLA AGRONOMY

2. Genotype, location and year influence the quality of canola grown across southern Australia, PingSi¹, Rodney Mailer², Nick Galwey¹ and David Turner^{1, 1}Plant Sciences, Faculty of Agriculture, The University of Western Australia, ²Agricultural Research Institute, New South Wales Agriculture

3. Development of Pioneer^® Canola varieties for Australian market,Kevin Morthorpe, StephenAddenbrooke, Pioneer Hi-Bred Australia Pty Ltd

4. Canola, Erucic Acid, Markets and Agronomic Implications, Peter Nelson, The Grain Pool …

Crop Updates 2000 - Lupins, Bill O'Neill, Geoff Thomas, Mark Sweetinham, Kedar Adhikari, Nick Galwey, Miles Dracup, Bob French, Debbie Thackray, Jenny Hawkes, Roger Jones, Françoise Berlandier, Yvonne Cheng, Lisa Smith, Chris Gazey, Michael O'Connell, Peter Carlton, John R. Peirce, Brad J. Rayner, Terry Piper, Peter Newman, Cameron Weeks, Mohammad Amjad, Glen Riethmuller, Paul Blackwell, Jairo A. Palta, Neil C. Turner, Robert J. French, Tim Setter

Crop Updates

This session covers nineteen papers from different authors:

1.1999 Lupin Highlights, Bill O’Neill, LUPIN PRODUCTIVITY IMPROVEMENTS AND INDUSTRY DEVELOPMENT

LUPIN ANTHRACNOSE

2. Anthracnose – 1999/2000, Geoff Thomas and Mark Sweetingham, Agriculture Western Australia

LUPIN BREEDING AND AGRONOMY

3. The genetic control of mildly restricted branching in narrow-leafed lupin (Lupinus augustifolius L), Kedar Adhikari^1,3, Nick Galwey^1,3 and Miles Dracup^2,3 1Plant Sciences, University of Western Australia 2Agriculture Western Australia ³Cooperative Research Centre for Legumes in Mediterranean Agriculture, University of Western Australia

4. Genotype x time of sowing interaction in lupins – Mingenew, Bob French, …

The Effect Of Salinity Level Upon The Yield, Root Growth, And Water Extraction Of Contrasting Rooting Subpopulations Of Alfalfa (Medicago Sativa) Under Conditions Of Zero Leaching, Laura A. Vincent

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A major problem in irrigated agriculture in the Western U.S. is the gradual accumulation of salinity in the plant root zone. These nonuniformly saline soils contain increasing amounts of salinity with depth, and salt accumulation is accelerated in situations where leaching is minimized. Root growth and thus plant yield is limited in these soils due to decreased water uptake. We studied the root growth of two subpopulations of alfalfa differing in their ability to produce fibrous roots to determine if altering root morphology would increase plant yield and water extraction, in an irrigated saline soil.

Soil profiles for a control …

Effect Of Subsoiling On Yield Of Burley Tobacco, Kenneth L. Wells, Kim D. Strohmeier

Soil Science News and Views

Compaction of tobacco fields caused by overworking or working soils when they are too wet has become a topic of concern to burley producers in recent years. Despite the viewpoint of some producers that annual subsoiling of tobacco fields is a profitable practice, particularly on soils which percolate water slowly, the University of Kentucky College of Agriculture recommends subsoiling only for a defined compaction problem. In such cases, some field studies have shown increased yields of burley to tillage practices that penetrate and shatter the compacted layer. Questions persist, however, about the effectiveness of single shank subsoilers used annually by …

The Effect Of Rate And Source Of Potassium Fertilizer On Cured Leaf Yield Of Burley Tobacco And Leaf Content And Soil Test Levels Of Potassium And Magnesium, Kenneth L. Wells, James E. Dollarhide, Mark Reese

Soil Science News and Views

In response to questions being asked by tobacco growers about the effectiveness of sulfate of potash magnesia (SPM; 21% K₂O and 11% Mg) as coinpared to sulfate of potash (SP; 50% K₂O), field studies were conducted during 1993-1994 to compare the two potassium (K) sources for use on burley tobacco. Any effect of SPM on yield of tobacco should be due to Mg since the only difference between the two sources in kind of nutrient contained is the presence of magnesium (Mg) in SPM. To compare the two K sources, we selected field sites low enough …

Effectiveness Of Surface Application Of Phosphorus And Potassium On Yield Of No-Till Corn Grown On Soils Testing Low Or Medium Below A Depth Of 3 Inches, Grant W. Thomas

Soil Science News and Views

When crops are grown continuously under no-tillage or very minimum tillage, there is a tendency for phosphorus (P) and potassium (K) to become concentrated at or near the soil surface. This occurs when P and K fertilizers are broadcast on the surface and not mixed with the soil as would occur with plowing. The result is a stratification of P and K such that the surface few inches become very high in those nutrients, but soil test levels remain largely unaffected below that. The question is whether high yields of no-till crops can be obtained under these conditions.

The Effect Of Fall And Spring Tillage Of A Compacted Soil On Corn And Tobacco Yields, Kenneth L. Wells, Roy V. Catlett

Soil Science News and Views

Soil compaction is being diagnosed in increasing instances as the cause of poor crop performance in Kentucky. While the basic causes of compaction can usually be identified, it is much more difficult to prescribe techniques to solve the problem. Following identification of compacted soil as being the cause of poor corn growth in a field in Shelby County, Kentucky, a study was conducted to compare three tillage tools on production of corn and tobacco. The compacted zone was within the top 6-inch layer of soil.

Control Measures For Manganese Toxicity Of Burley At Transplating Time, Kenneth L. Wells, J. L. Sims

Soil Science News and Views

Manganese (Mn) toxicity of burley tobacco is viewed by tobacco specialists in Kentucky as the greatest single factor which reduces yields. Estimates are that this problem adds 30 to 50 million dollars to the cost of burley production because of the greater acreage (and all associated costs) required by growers to produce their allotment. And, even though the cause and cure of Mn toxicity has been known for about 50 years, many growers are caught each year at transplanting time with no knowledge as to whether Mn toxicity may be a problem in their fields. The solution to Mn toxicity …

Effect Of Soil Water Stress And Irrigation On Growth, Yield And Quality Of Burley Tobacco, Ronald E. Phillips, J. E. Leggett

Soil Science News and Views

An experiment was conducted for a period of three years, 1982, 1983 and 1984, in order to evaluate the effects of soil water stress and irrigation on growth, yield and quality of burley tobacco at Spindletop Farm, Lexington. The variety KY 21 was grown all three years. Three treatments were used in the experiment: (1) check, rainfall only, not irrigated, (2) well watered, rainfall plus supplemental irrigation, and (3) water stressed beginning 50 days after transplanting. The soil of treatment 3 was covered with black plastic to prevent rainfall from entering the soil.