Nitrogen Accumulation in Soybean Following Defoliation

Morphological and Grain Yield Responses of Soybean (Glycine Max L.) to Time and Intensity of Defoliation Under Application of Amino Acid

“…Our finding that increasing levels of defoliation leads to progressive declines in grain oil and protein yield, but not significantly affected protein percentage (Table 6). This result agreed with the report by Turnipseed (1972) and Xiangjun et al (2009) and that defoliation caused no decrease in seed protein content. Nitrogen (one of the important elements in protein synthesis) absorption following defoliation may be promoted.…”

“…Defoliations in the early stages of growth apparently does not affect yield and yield components positively or negatively, an observation that is consistent with other types of crops, such as corn and garlic (Olfati et al, 2010). Xiangjun et al (2009) reported that although defoliation temporarily reduced soybean dry weight and N accumulation during 15 days after defoliation.…”

“…In the experiments of Xianjun et al (2006,2009), the effect of defoliation of soybean under salinity stress or application of nitrogen fertilizer were investigated. The effect of defoliation on growth and yield characteristics in plants varied with time and intensity of defoliation (Xiangjun et al, 2009). In the present study, effects of time and intensity of defoliation were significant on morphological traits, and yield and yield components such as plant height, first pod height, numbers of lateral and main branch, number of total pod, number of grain, 100-grain weight, biological yield, grain yield, and harvest index (Tables 3 and 4).…”

“…Defoliation caused by insects is common biotic stress in soybean [Glycine max (L.) Merr.] production (Xiangjun et al, 2009). The effects of defoliation on yield and yield components of soybean have been well studied, but time and intensity of defoliation have not been demonstrated.…”