It was proposed that the pod wall surrounding the developing soybean seed (growth stage R6) could serve as a diagnostic indicator of crop nutritional status. This was evaluated by summarizing soybean responses (R1 trifoliate and R6 pod wall P and K concentrations, and yield) to various levels of soil P and K availability in ten field experiments. Pod wall P and K concentrations were closely related to available soil P (Bray P1) and K (M NH4C2H3O2-PH 7.0), respectively. The relationship of pod wall P concentration to grain yield was superior to those found when either trifoliate leaf P or available soil P was related to grain yield. Pod wall K was similarly superior to leaf K or available soil K. Though further work is needed to describe changes in pod wall composition during grain-fill, it appears that pod wall sampling offers an alternative or additional sampling interval in the evaluation of soybean nutrition.
|Number of pages
|Communications in Soil Science and Plant Analysis
|Published - Jan 1 1989
Copyright 2015 Elsevier B.V., All rights reserved.
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science