National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
An experiment was carried out in the Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani during 2017-18 in order to evaluate the effect of phosphate solubilizers on the activity of different enzymes and microbial parameters in the soil and its impact on crop growth and yield of test crop tomato var. Vellayani Vijai. The experiment was laid out in a randomized block design with fourteen treatments and three replications. Treatments were the combinations of four doses of P (100%, 75%, 50%, 25%) along with P solubilizers (AMF, Pseudomonas, and Bacillus.). From the study, an increasing activity of dehydrogenase was observed over a period of four months. At the harvesting stage, the highest value of 336.7 μg of TPF released g-1 was observed in the treatment T3 (75% P +AMF). It was observed that the activities of acid and alkaline phosphatase were significantly influenced by the treatment at 2, 3 and 4 MAP. An increasing trend of acid phosphatase was observed up to 3MAP followed by a decline. At 4MAP, the highest value of 59.89 μg of p-nitrophenol released g-1 of soil 24 h-1 was observed in T11 (PSB). From the study, it was observed that the treatment did not impose any significant effect on the activity of urease upto 3 MAP. However, an increasing trend of urease enzyme over a period of 4 months is noticed. The highest activity was noticed with the application of 50% P and AMF (69.45 ppm of urea hydrolysed g-1). Regarding MBC, the treatment T9 (25% P + AMF) registered the highest value of 380 μg g-1 soil where the treatment T5 (50% P + PSB) recorded the highest MBP content of 71.83 μg g-1 soil. The highest value for MB C/P was recorded by the treatment T14 (Absolute control) (14.28). Microbial load of P solubilisers was found to be high in the treatment T5 (50% P + PSB) with average value of 3.60 log cfu g-1.
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