Phosphorus pools under integrated phosphorus management of upland direct- seeded rice (Oryza sativa) in North-Eastern Hill region of India

SASMITA TRIPATHY; S.L. MEENA; SUBHASH BABU; T.K. DAS; SHIVA DHAR

doi:10.59797/ija.v66i4.2879

Authors

SASMITA TRIPATHY
S.L. MEENA
SUBHASH BABU
T.K. DAS
SHIVA DHAR

DOI:

https://doi.org/10.59797/ija.v66i4.2879

Keywords:

Direct-seeded rice, Phosphorus fractionation, Phosphorus solubilizing bacteria, Reductant soluble P, Soluble and loosely bound P

Abstract

A field experiment was carried out during the rainy (kharif) season of 2019 at Umiam, Meghalaya, to determine the phosphorus pools in acid soils of upland direct-seeded rice (Oryza sativa L.) in North-Eastern Hills region un- der varying phosphorus-management practices. Eight treatments with combinations of different nutrient sources, both organic and inorganic were taken replicated thrice in a randomized block design. The treatments involving chemical fertilizers resulted in higher levels of inorganic P (232 mg/kg) owing to an increase in FeP, AlP and CaP pools. On the other hand, treatments utilizing organic sources of nutrients like farmyard manure (FYM), vermicompost and poultry manure showed higher levels of organic-P (168 mg/kg) in soil. Application of integrated organic nutrient sources as in 25% farmyard manure + 25% vermicompost + 25% poultry manure + phosphorus- solubilizing bacteria resulted in significantly higher available-P (5.5 mg/kg) and organic-P pool (168.2 mg/kg) over the other treatments. But the total P was significantly higher with 100% recommended fertilizer dose (391.5 mg/kg) which showed an increase of 10% over the control.

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