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Texas Tech University (2016)

Harvest-aid efficiency in Guar (Cyamopsis tetragonoloba (L.) Taub.) in the Texas Plains

Shockey, Jonathan

Titre : Harvest-aid efficiency in Guar (Cyamopsis tetragonoloba (L.) Taub.) in the Texas Plains

Auteur : Shockey, Jonathan

Université de soutenance : Texas Tech University

Grade : Master of Science (MS) 2016

Résumé
The regions known as the Texas High and Rolling Plains are considered arid or semi-arid climates. These regions receive less than 25 cm, and 25 to 50 cm of rainfall annually. However, despite these climatic disadvantages the large portions of arable lands in these regions are put to use in crop production. The major crops of these regions are cotton (Gossipium hirsutum (L.)), wheat (Triticum aestivum (L.)), irrigated peanuts (Arachis hypogeae (L.)), irrigated corn (Zea maizes (L.)), and sorghum (Sorghum bicolor (L.)) as well as many other lesser grown alternative crops. Due to current climatic changes as well as depletion of ground water producers have begun to alter traditional farming practices by adopting new practices such as cover cropping, no-till farming, and crop rotation with more drought tolerant crops to maintain profitability and sustainability. Some producers are turning to guar, Cyamopsis tetragonoloba (L.) Taub., as a crop to be placed in a rotation with less water efficient crops as well as a catch crop after a failed first crop. Although guar is a drought tolerant legume, production is not without obstacles. Guar has an indeterminate grow habit and the stem tends to remain moist well after a hard freeze, lengthening the time harvestable yield is left in the field to weather and diminish in both quality and quantity. The use of herbicides known as harvest aids has the potential to alleviate some of these issues by artificially drying the crop earlier than would be possible by natural means. Two different trials were conducted to determine the efficacy of seven commercial harvest aids in guar and to determine proper timing of application of these harvest aids. Herbicidal activity of these chemicals was evaluated at 0, 7, 14, and 28 days post treatment by rating treated plots for color change, percent green pods remaining, percent terminal growth remaining, and the occurrence of regrowth. In addition to activity ratings yield and weathered seed measurements were also collected.

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