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 |
The rice-wheat cropping system, which is considered as the backbone of food self-sufficiency, is facing a sustainability problem due to practices of modern production system with indiscriminate use of chemical fertilizers and pesticides. So, effects of long term use of mineral fertilizers and farmyard manure (FYM) under rice (Oryza sativa)–wheat (Triticum aestivum) cropping system in a Mollisol was investigated. Rice and wheat yields were highest (51.47 and 48.60 q ha-1, respectively) with 100% NPK + 15 t FYM ha−1 and lowest in control (13.72 and 11.85 q ha-1, respectively). Balanced fertilizers use of (100% NPK + Zn) was also at par with 100% NPK + FYM treatment in rice and wheat yields. The FYM amended treatment gave the highest and signiï¬cantly more counts of bacteria, fungi and actinomycetes in all four depths of soil (0-15cm, 15-30cm, 30-45cm and 45-60cm) as compared to all other treatments after crop harvest. The observed microbial biomass C with 100% NPK + FYM in four soil depths were (413.36, 193.50, 100.11 and 66.41 after rice and 435.93, 235.54, 142.64 and 82.41 µg g-1 after wheat, respectively, which was highest and significantly higher over all other treatments. Soil enzymes dehydrogenase, acid and alkaline phosphatase and urease activities were significantly higher with 100% NPK + 15 t FYM ha−1 than all the other treatments. Mineral fertilizer treatments with 100% NPK and 150% NPK were comparable and signiï¬cantly better than application of 50% NPK, 100% N and 100% NP in different soil biological properties. Application of Zn with 100% NPK increased the crop yields and soil biological properties over 100% NPK. Imbalanced use of mineral fertilizers had the harmful effect on soil biological health.
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