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Full-Text Articles in Weed Science

Using Drones For Precision Agriculture, Jiyul Chang, Madhav P. Nepal May 2019

Using Drones For Precision Agriculture, Jiyul Chang, Madhav P. Nepal

Madhav Nepal

In this teaching module, students will learn what Precision Agriculture is and how to apply drone into Precision Agriculture practices. To use data (images) taken by drone, students will learn the basic theory of Remote Sensing. Using images, students learn how to make NDVI (Normalized Difference Vegetation Index) maps and how to apply drone (remote sensing technique) in agriculture.

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Weed Seed Germplasm Collection 1964-2014 Of The Weed Biology Laboratory, Jack Dekker Mar 2014

Weed Seed Germplasm Collection 1964-2014 Of The Weed Biology Laboratory, Jack Dekker

Jack Dekker

J. Dekker weed seed germplasm collection; including: Lots 1-3974: 1964-2014; main seed library listed by lot numbers. Lots 649-1457: 1989 all-Iowa Setaria transect study. Lots 1762-1812: 1981; Diane Manthey, North Dakota St. Univ., Setaria collection at Bob Anderson's (USDA, Univ. of Minn) 1960's wild oat study sites. Lots 2389-2595: 1992 north temperate world collection (Japan, Russia, Europe) by J. Dekker. Lots 3270-3685: 1993 Brent Reschly transect study of eastern Iowa conventional and Amish farmers. Lots 3786-3962: 2000 J. Dekker 2000 salt-tolerant Setaria of southern Japan collection. All seed in all these collections belong, and were collected and archived by Jack …

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Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona Dec 2013

Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona

Victor D. Carmona-Galindo

Castor bean (Ricinus communis L.) is a myrmecophytic plant species with specialized extrafloral nectar (EFN) glands that serve to attract predatory insects, which in return defend plant-tissues against herbivores. The EFN glands on castor bean plants are located along the leaf petioles as well as on the peduncles of its imperfect (unisexual) flowers. This field-project evaluates the richness, diversity, and species assemblage of insects visiting EFN glands located on (female and male) flower peduncles and leaf petioles on castor bean plants growing in a Southern California coastal landscape. We detected that EFN glands on female-flower peduncles were visited by an …

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Farming Systems Research On Crop Diversification, Tillage, And Management Effects On Yield, Pests, And Environmental Quality In A Semi-Arid Environment, Andrew W. Lenssen, U. Sainju, T. Caesar-Tonthat, B. Allen, R. Lartey Jan 2007

Farming Systems Research On Crop Diversification, Tillage, And Management Effects On Yield, Pests, And Environmental Quality In A Semi-Arid Environment, Andrew W. Lenssen, U. Sainju, T. Caesar-Tonthat, B. Allen, R. Lartey

Andrew W. Lenssen

Available water, depleted soil quality, and weed competition are important constraints to crop production in the northern Great Plains. The traditional rotation in the region has been spring wheat with summer fallow, which is used to accrue additional soil moisture for the subsequent wheat crop. Tillage during fallow periods controls weeds, which otherwise would use substantial amounts of water and inorganic nitrogen, decreasing the efficiency of fallow and increasing soil erosion. Chemical fallow and zero tillage systems improve soil water status for subsequent crops (Lenssen et al., 2007a), allowing for increased cropping intensity and improved nutrient cycling (Lenssen et al., …

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