Yield components and their relationship with total and extractable foliar phosphorus in soybean

Abstract

Six soybean cultivars (maturity group V) were sown in a Typic Argiudoll. Experimental plots were arranged in a randomized block design with three replications. Sampling dates were at different stages: R2, R4, and R5. Two foliar phosphorus (P) forms were determined: total P (TP) and dilute acetic acid‐extractable P (DAEP) which correlated with each other and with some yield components. At the R2 stage, there was a good correlation with node number in the R5 stage and TP, DAEP, and petioles‐DAEP. Weight of 1000 grains was asssociated with foliar P measured later in the R4 and R5 stages.