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EFFECT OF PHOSPHORUS SOLUBILISING BACTERIA ON PHOSPHORUS FRACTIONS AND PLANT GROWTH IN TURMERIC

By: K. Alex, RoseMaterial type: TextTextPublication details: INDIRA GANDHI KRISHI VISWAVIDYALAYA RAIPUR (Chhattisgarh) 2021Description: 86pSubject(s): BACTERIA | TURMERIC | PHOSPHORUS SOLUBILISING
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Turmeric as a rhizomatously benefitted crop for both agricultural and commercial purposes, requires considerably greater amount of nutrients in the growing medium, especially phosphorus. The acidic soils of Kerala is facing a major constraint in terms of phosphorus availability because of high P fixing capacity of the soil. Thus, limiting the P uptake of the crop and thereby affecting the root development, growth and yield. Higher addition of P fertilizers gets not only fixed in the soil but also exploits the soil fertility. So, we aimed to increase the phosphorus availability to the crop using phosphorus solubilizing bacteria, which is an ecofriendly microbiological strategy with the fact that the P fraction that gets solubilized depends largely on the organism. In this study, we incorporated two Bacillus sp. (B. safensis + B. cereus) into the soil for the microbial solubilization of phosphorus and increase the amount of plant available phosphorus in soil. The experiment was conducted in CRD with 9 treatments including both discrete and in combination of the two PSB on turmeric var. IISR Prathibha with and without rock phosphate as P fertilizer. The soil samples collected at three different sampling period (90 DAP, 120 DAP, Harvest) were undergone sequential fractionation of phosphorus to evaluate the influence of PSB on different inorganic P fractions (saloid P, Al – P, Fe – P and Ca – P fractions). In samples from 90 DAP, Ca – P contributed highest percentage share in total P followed by Fe – P, saloid P and Al – P. While after 120 days, it was Fe – P that had highest contribution. But in the harvest samples, it was in the order, Fe – P> Ca – P> Al – P> saloid P. Also, there was a significant positive correlation between Ca – P and saloid P (r=0.67*) and a significant negative correlation between Ca – P and Al – P (-0.67*). This reveals the fact that PSB has solubilized a substantial amount of Ca – P into plant available P form. Also, rhizome yield was equally highest in both 75% P + B. safensis and 75% P + B. safensis + B. cereus with 271.67g per pot while, 75% P + B. safensis had highest curcumin, oleoresin and oil content. N and P uptake of plants was highest in 75% P + B. safensis and K uptake in 75% P + B. safensis + B. cereus.and oil content. N and P uptake of plants was highest in 75% P + B. safensis and K uptake in 75% P + B. safensis + B. cereus.

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