Genetic Variation for Phosphorus Use in Rice at Two Levels of Soil Applied Phosphorus
Rice genotypes differed significantly in their growth response. Growth response in terms of paddy yield was influenced by P application, genotype and their interaction. Relative reduction in paddy yield ranged from none to 13%. The genotypes K. Basmati, NIAB-6, IRRI-6, Kernal, Basmati-370 and KSK-282 showed positive response to P application. Mostly genotypes with high P concentration had low P uptake, low phosphorus use efficiency and hence low paddy yield. NIAB-6 had used phosphorus efficiently at control P level. Rice genotypes NIAB-6, IRRI-6 and K. BASMATI were P responsive and productive and hence could be regarded as P-efficient rice genotypes. Phosphorus efficient genotypes could be grown under native or little P fertilizer application conditions.
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