Effects of simulated insect defoliation and annual weed competition on soybean and velvetleaf development

摘要: The separate and combined effects of velvet!eaf competition simu­ lated green cloverworm defoliation on soybean morphological development were evaluated in a 3-year field study. Statistical confirmation velvetleaf stress was limited to soybeans weed-proximate posi­ tions. Pre-harvest, weed-induced reductions nodes with unrolled fully-developed leaves (1981 only) transient leaf area de­ velopment determined statistically significant. In comparison, the SGCW procedure reduced area, height, pre-harvest lodging, lower-leaf abscission (1 2 years). Nodal lagged slightly 1980 defoliated plots. No treatment altered stand counts, branching, reproductive phenology, or gravimetric soil mois­ ture determinations significantly. Although evidence apparent weed-altered noted, actual statistical x interactions not realized this