Author(s):

Himanshu Patel, Vidyanand Mishra, Brajendra, Rajkamal Patel and Amarjeet Kumar

Abstract: The objective of experiment is to study the P uptake pattern of rice genotypes and an attempt has been made in this study to screen out low P tolerates rice cultivators. The field experiment was conducted in kharif season 2015 at the research farm of Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana. Initial soil analysis characterization carried out for which previous soil analysis showed near neutral soil pH (7.2 to 8.2) with low to high status in available phosphorus. This augmented well as a gradient was selected. Out of number of plots available, low P plots was used for selecting the genotypes tolerant to low P condition. However, to screen the genotypes for their P use efficiency and response to its application, the 30 genotypes were taken under different gradients so as to compare their performance under different regimes of P application. Therefore, low P plots were divided into 4 sub-plots with different gradients (i.e. absolute control, 20 kg P2O5/ha, 40kg P2O5/ha and 60kg P2O5/ha). Among genotypes in absolute control swarna uptake highest 2.98 kg/ha grain P followed by sugandhmati 2.52 kg/ha followed by akhayadhan 2.27 kg/ha. therefore this varieties should be most suitable for organic farming.Uptake of all genotypes increases with increasing phosphorus levels and maximum at 60kg P2O5/ha while PUE of all genotypes decreases with increasing phosphorus levels.

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