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The Effect Of Gypsum Amendments On The Displacement Of Exchangeable Aluminum From Acid Bt Horizons., Charles Kanmu Mulbah
The Effect Of Gypsum Amendments On The Displacement Of Exchangeable Aluminum From Acid Bt Horizons., Charles Kanmu Mulbah
LSU Historical Dissertations and Theses
Two acidic silt loam soils, Beauregard and Gigger were used in a study involving Ca movement and Al displacement from 15.2 cm laboratory soil clumns. Each column was uniformly packed to the appropriate bulk density. The top 5.1 cm portion of each column contained soil pre-mixed with powdered gypsum at rates of 0, 1 and 2 equivalents of the exchangeable Al. Calcium movement and Al displacement in the soil columns were accomplished by applying distilled-deionized water at a constant flow rate and the effluent was analyzed. In addition, a pulse containing dissolved gypsum at the rate of 4 Al equivalents …
Behavior Of Euphorbia Heterophylla Seed Bank., Vernon B. Langston
Behavior Of Euphorbia Heterophylla Seed Bank., Vernon B. Langston
LSU Historical Dissertations and Theses
Short term burial of freshly harvested seed and soil disturbances in agricultural populations of wild poinsettia (Euphorbia heterophylla L.) indicated a very low carry over of seeds into the second season after dissemination. After seeds were buried at 10, 50, 100, and 200 mm in the fall; 4%, 81%, 30% and 1%, respectively, produced seedlings during the following growing season, and only 3%, 1%, < 1%, and 3% of the seeds, respectively, were viable after one year. Soil disturbances (tillage) did not affect seedling recruitment or longevity of wild poinsettia seed. Early planting dates (May 1) of soybeans required 6 weeks of weed-free maintenance to prevent serious reinfestation and subsequent yield reductions in fields with a high agronomic seed bank of wild poinsettia, whereas for late planting dates (June 10) 3 weeks of weed-free maintenance was required. No significant difference in yield was detected between one or two cultivations for either planting date.
A Comparison Of Sugarcane Seedling And Vegetative Shoot Reaction To Sugarcane Mosaic Virus., Abdul Awal
A Comparison Of Sugarcane Seedling And Vegetative Shoot Reaction To Sugarcane Mosaic Virus., Abdul Awal
LSU Historical Dissertations and Theses
Sugarcane seedlings, Saccharum (interspecific hybrids) from a susceptible by susceptible (S x S) cross, a moderately susceptible by susceptible (MS x S) cross, a susceptible by moderately susceptible (S x MS) cross, and a susceptible by resistant (S x R) cross were categorized with regard to mosaic resistance after inoculation with strains H and I of Sugar Cane Mosaic Virus (SCMV). No particular relationship was observed among the four crosses on the basis of seedling reactions to SCMV. All seedlings were planted in the field. All susceptible and resistant seedlings were further classified respectively as highly susceptible (HS), moderately susceptible …
Nitrification At The Rice Root., Chayong Nammuang
Nitrification At The Rice Root., Chayong Nammuang
LSU Historical Dissertations and Theses
Nitrification at the rice root was investigated. Nitrifiers were found in the rice rhizoplane, rhizosphere and non-rhizosphere soils under flooded conditions. They were greater in the rhizoplane than in the rhizosphere soil and greatest at the heading stage of rice growth. Ammonium-sulfate or NaNO(,2) injected into the flooded soils with growing rice plants did not increase the activities of nitrifiers in the rice rhizoplane. Incubation of the flooded soil with (NH(,4))(,2)SO(,4) or NaNO(,2) did not increase the activities of NH(,4)('+)- or NO(,2)('-)-oxidizers in soils without rice. The (NH(,4))(,2)SO(,4) did not increase denitrifiers, but incubation with NaNO(,2) caused an early increase …