TITLE:
Grasspea (Lathyrus sativus L.) as a Green N Source Reduces the Effects of 2,4 D in Susceptible Cotton (Gossypium hirsutum L.) Cultivars
AUTHORS:
Travis W. Witt, Brian K. Northup, James P. S. Neel
KEYWORDS:
Gpssypium Hirsutum, 2, 4 D, Green Manure
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.12 No.7,
July
15,
2021
ABSTRACT: Cotton (Gossypium hirsutum L.) production in
Oklahoma has more than tripled in the last ten years. This increase in cotton
acreage in Oklahoma, a region that traditionally produces winter wheat, has led
to increased incidences of 2,4 D contamination in sprayers that are used to
spray cotton crops. Cotton is extremely sensitive to 2,4 D, with losses of
yield and ultimately profit to the cotton producer in cases of drift or tank
carryover. In this study, six cotton cultivars (three 2,4 D susceptible and
three 2,4 D tolerant) were grown in combination with four N treatments to determine the benefits or drawbacks of using a
green manure as N source. Seedcotton, seed, and lint yield were all negatively
impacted by 2,4 D in the susceptible cultivars. Additionally, water use was
increased in the susceptible cultivars compared to the tolerant cultivars. The
negative effects of 2,4 D on cotton growth were partially mitigated by grasspea, though the supply of too much nitrogen increased the negative effects of 2,4 D.
Applying nitrogen to a susceptible cultivar of cotton contaminated by 2,4 D is
not recommended for short season environments like Oklahoma.