Author(s):

Abhinav Kumar and JK Singh

Abstract: A field experiment was conducted at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, India during the two consecutive rainy (Kharif) and winter (Rabi) seasons of 2015-16 and 2016-17 with rice-wheat sequence in split plot design to study the influence of integrated nitrogen management on plant nutrient concentration in rice and properties of soil under system of rice intensification. The results obtained from the two years study showed that the nitrogen content in the grain and straw remained significantly unaffected due to the various varieties of rice. Among integrated nitrogen management, the higher concentration of nitrogen in grain and straw of rice was attributed to the plots treated with 75% recommended dose of nitrogen (RDN) through urea along with 25% nitrogen through Azolla microphylla which was at par with the application of 75% RDN + 25% RDN through sewage sludge applied to rice crop. The results on phosphorus content in grain and straw of rice revealed the non-significant variation due to different varieties and integrated nitrogen management practices. Further, the potassium content in grain recorded higher with the rice variety ‘HUR-4-3’ being at par with ‘HUR-105’ while, the potassium content in straw was highest with ‘HUR-4-3’. The integrated nitrogen management with 75% RDN and 25% N through Azolla microphylla exhibited the highest content of potassium in grain and straw. Moreover, different varieties and integrated nitrogen management applied to rice crop resulted statistically non-significant variation in soil properties viz., bulk density, particle density, water holding capacity and electrical conductivity during the course of study.

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