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COMPARISION OF REDUCED P APPLICATION AND SUPPLEMENATAL ENHANCEMENT OF SELECTED NUTRIENTS ON THEIR AVAILABILITY AND YIELD OF RICE (Oryza sativa L.) CROP IN HIGH- P SOIL

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Title COMPARISION OF REDUCED P APPLICATION AND SUPPLEMENATAL ENHANCEMENT OF SELECTED NUTRIENTS ON THEIR AVAILABILITY AND YIELD OF RICE (Oryza sativa L.) CROP IN HIGH- P SOIL
 
Creator ANAND SINGH, MAISHNAM
 
Contributor SURENDRA BABU, P
 
Subject NUTRIENTS, YIELD, RICE, CROP, HIGH- P, SOIL
 
Description The present investigation entitled “Comparison of Reduced P Application and
Supplemental Enhancement of Selected Nutrients 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 determine (i) the availability of Nitrogen, Sulphur, Zinc
and Boron 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 and (iii) to identify the most required nutrient among N, S,
Zn, B, Fe Spray to augment the yield by supplementing them beyond the current
recommended levels.
One 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,
Zn, S and B. Net house experiment was conducted employing a high- P soil (89 kg P2O5
ha-1) using paddy as test crop with nine (9) treatments comprising different individual
supplementation doses and their combination of N, S, Zn, B, Fe Spray and
Multimicronutrient Sprays in combination of two levels of P application (100 % and 70 %
RDP).
The development of different P – fertility regimes using P- fixation characteristic
curve was satisfactory. Under laboratory condition, the availability of N, S, Zn and B
increased with increasing levels of their applications, irrespective of soil P fertility regimes
in 45 days of contact period. Likewise, the availability of N and S increased with the
increase in contact period from 15 to 45 days. However, in case of boron and zinc, their
availability decreased as the contact period in the soil increased from 15 to 30 days and
there after increased by 45th day of incubation.
The enhanced P- fertility regime had significant effect on availability of
nutrients under study under laboratory condition. The nitrogen availability increased from
223 to 299 kg N ha-1 in the same soil as the P- fertility regime shifted from low to v.v high
thereby registering a 34 per cent enhancement. Sulphur extraction by CaCl2 extractant
increased by 46 per cent in 45 days from 15.39 to 22.53 mg S kg soil-1 with increased P –
fertility regime. However, the hot water soluble boron extraction decreased by 22 per cent
(from 3.28 to 2.55 mg kg-1) as the P fertility regime of the soil increased from low (16 kg
P2O5 ha-1 to v.v high (128 kg P2O5 ha-1) status.
The Net House experiment result revealed that additional application of nutrients
like N, S, B, Zn and their combination beyond their recommended levels affect the yield of
paddy in a high P soil. Application of boron @ of 25 % RD B helps in increasing the
paddy grain yield most by 16 per cent, S by 13 per cent, N by 7 per cent and N + S by 22.4
per cent indicating that boron is most useful to increase the yield in a high- P soil even
when its content is above critical limit. This observation is also back- up with incubation
study results varying applied boron availability decrease with the increase in the soil- P
fertility regime.
The choice between reducing the P- fertilizer in a high- P soil without affecting
the yield and enhanced yield with addition of supplemental doses of nutrients like boron or
sulphur will determine whether the reduction in input cost is priority or improving the
productivity with little more expenditure. Both these aspects need field level verification
and also will determine how long the accumulated P in the soil with support such
activities.
 
Date 2016-09-14T10:18:27Z
2016-09-14T10:18:27Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76561
 
Language en
 
Relation D9715;
 
Format application/pdf
 
Publisher PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD