Insufficient nitrogen supply from symbiotic fixation reduces seasonal crop growth and nitrogen mobilization to seed in highly productive soybean crops.

ABSTRACT: Nitrogen (N) supply can limit the yields of soybean [Glycine max (L.) Merr.] in highly productive environments. To explore the physiological mechanisms underlying this limitation, seasonal changes in N dynamics, aboveground dry matter (ADM) accumulation, leaf area index (LAI) and fraction of absorbed radiation (fAPAR) were compared in crops relying only on biological N₂ fixation and available soil N (zero-N treatment) versus crops receiving N fertilizer (full-N treatment). Experiments were conducted in seven high-yield environments without water limitation, where crops received optimal management. In the zero-N treatment, biological N₂ fixation was not sufficient to meet the N demand of the growing crop from early in the season up to beginning of seed filling. As a re

SUBMITTER: Cafaro La Menza N 

PROVIDER: S-EPMC7496333 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature