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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2019.8(10): 1102-1112
DOI: https://doi.org/10.20546/ijcmas.2019.810.129


Comparison of Reduced P Application and Supplemental Enhancement of Nitrogen (N) and Zinc (Zn) on their Availability and Yield of Rice (Oryza sativa L.) Crop in High- P Soil
Maishnam Anand Singh1*, P. Surendra Babu2 and M. Chandini Patnaik2
1Department of Soil Science, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad-500030, India
2AICRP on Micro & Secondary Nutrients and Pollutant Elements in Soil and Plants); A.R.I, Rajendranagar, Hyderabad- 500 030, India
*Corresponding author
Abstract:

The present investigation entitled “Comparison of Reduced P Application and Supplemental Enhancement of Nitrogen (N) and Zinc (Zn) on their Availability and Yield of Rice Crop (Oryza sativa L.) in High-P Soil” was carried out at AICRP on Micronutrients, Hyderabad Centre, ANGRAU to (i) determine the availability of nitrogen and zinc under different P regimes of the same soil, (ii) to determine whether reducing the P application or supplementing additional nutrients is a better choice in high- P soil in terms of yield of paddy crop. A laboratory experiment was conducted after developing low (16), medium (40), high (63), v. high (102) and v.v high (128 kg P2O5 ha-1) soil- P fertility regimes of a low P soil using its P- fixation characteristic curve and by employing 3 levels each of N and Zn to determine the availability of these nutrients under different P- fertility regimes. Net house experiment was conducted employing a high- P soil (89 kg P2O5 ha-1) using paddy as test crop with two (2) treatments comprising different individual supplementation doses and their combination of N and Zn in combination of two levels of P application (100 % and 70 % RDP). Different P–fertility regimes were made using P- fixation characteristic curve. Under laboratory condition, the availability of N and Zn increased with increasing levels of their applications, irrespective of soil P fertility regimes in 45 days of contact period. Likewise, the availability of N increased with the increase in contact period from 15 to 45 days. However, in case of zinc the availability decreased as the contact period in the soil increased from 15 to 30 days and there after increased by 45th day of incubation. Under laboratory condition the nitrogen availability increased from 219 to 314 kg N ha-1 in the same soil as the P- fertility regime shifted from low to v.v high thereby registering a 43 per cent enhancement. The available DTPA- Zn extraction decreased by 22 per cent (from 3.28 to 2.55 mg kg-1) as the available soil P increased from 16 kg (low P-regime) to 128 kg P2O5 ha-1 (v.v high P-regime) of the same soil. The Net house experiment results revealed that additional application of nutrients like N and Zn and their combination beyond their current recommended levels enhanced the yield of paddy in a high P soil. Reduced level of P application (i.e. supply of 70% RDP only) to paddy crop decreased its grain yield over supplemental nutrients’ treatments in this high-P soil experiment when compared to that of full supply of 100% recommended dose of P indicating that additional supply of N augment the yield of paddy crop in a high-P soil but not when the P supply is reduced on such soil. The choice between reducing the P- fertilizer in a high- P soil without affecting the yield and realization of enhanced yield with addition of supplemental doses of nutrients will depend upon whether the reduction in input cost is priority or improving the productivity with little more expenditure.


Keywords: High P soil, Phosphorus fixation, RDF, RDP, P- fertility Regime, Yield, Paddy
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How to cite this article:

Maishnam Anand Singh, P. Surendra Babu and Chandini Patnaik, M. 2019. Comparison of Reduced P Application and Supplemental Enhancement of Nitrogen (N) and Zinc (Zn) on their Availability and Yield of Rice (Oryza sativa L.) Crop in High- P Soil.Int.J.Curr.Microbiol.App.Sci. 8(10): 1102-1112. doi: https://doi.org/10.20546/ijcmas.2019.810.129