Phosphorus accumulation in grains of japonica rice as affected by nitrogen fertilizer
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Background and aims
This study aims to investigate the effect of nitrogen (N) on grain phosphorus (P) accumulation in japonica rice.
Six cultivars with contrasting agronomic traits were grown for 3 years (from 2008 to 2010) of field experiments under seven N treatments and 1 year (in 2010) of pot experiments with five N treatments to study the effect of N on grain phosphorus accumulation and to explore its physiological foundation.
Grain total P and phytic acid concentration showed a clearly decreasing trend as N rate increased for both field and pot experiments. Pot experiment revealed that application of N increase plant biomass, but tended to lower plant P uptake, especially for the split topdressing treatments. Both harvest index (HI) and P harvest index (PHI) increased with N rate, but PHI was consistently higher than HI, indicating the larger proportion of P translocation to grain than that of dry matter by N. Further, ratio of PHI/HI differed significantly among genotypes, but was stable across contrasting N treatments.
The combination of decreased plant P uptake and dilution effect of increased grain yield by N is proposed as underlying mechanism of the decreased grain P concentration by high N.
KeywordsPhosphorus accumulation Nitrogen Grain Japonica rice
Control of N fertilizer treatment
Coefficient of variation
High nitrogen rate
Low nitrogen rate
Moderate nitrogen rate
This research was supported by grants from Program for New Century Excellent Talents in University (NCET-10-0472) and National Natural Science Foundation of China (30971733 and 31171485).
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