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Growth and Yield of Soybean Lines in Relation to Phosphorus Toxicity and Phosphorus, Potassium, and Calcium Requirements 1
Author(s) -
Mooy C. J.,
Pesek John
Publication year - 1969
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1969.0011183x000900020005x
Subject(s) - biology , phosphorus , toxicity , yield (engineering) , zoology , potassium , nutrient , calcium , agronomy , botany , chemistry , ecology , materials science , organic chemistry , metallurgy
High rates of P in pot experiments with three nutrient variables, P, K, and Ca, at 5 levels in a twice‐replicated 2(2 n )+2n+1 composite design resulted in combination of growth responses and P‐toxicity effects, threshold leaf contents for which are given. Significant growth and differential responses among soybean [ Glycine max (L.) Merrill] lines culminated in large yield responses with maxima at 450 to 500 kg P/ha. Differential growth effects developing in favor of a certain line may change between the 7‐leafed stage and the end of flowering in favor of another line. Treatments leading to maximum growth at the 7‐leafed stage contained too much P to proceed to maximmn growth and yield at later stages. Further screening of soybean lines should be directed at maximum nodulation or growth responses and minimum P‐toxicity hazard.