The Dynamic of Nitrogen Uptake from Different Sources by Pea (Pisum sativum L.)

Nitrogen uptake from various sources by plants capable of biological reduction N2 in symbiotic systems with root nodule bacteria is influenced many factors. The aim the study was to examine influence development stage and variety pea (Pisum sativum L.) cultivated years different temperature precipitation conditions on dynamics nitrogen atmosphere (Ndfa), fertilizer (Ndff), soil (Ndfs). Pre-sowing fertilization 15N isotope dilution method were used research. highest rate Ndfa noted between three-internode first visible flower buds outside leaves, while Ndff Ndfs 4-leaf 3-internode stage. lowest sowing four-leaf stage, when 50% pods typical length full maturity. all similar for cultivars, but significantly depended variable (years study).