EFFECT OF MOISTURE LEVELS AND COATED UREA FERTILIZERS ON RELEASE PATTERN OF NITROGEN IN AN ALFISOL AND VERTISOL
KrishiKosh
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Title |
EFFECT OF MOISTURE LEVELS AND COATED UREA FERTILIZERS ON RELEASE PATTERN OF NITROGEN IN AN ALFISOL AND VERTISOL
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Creator |
ANUDEEP NAIDU, K
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Contributor |
PADMAJA, G
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Subject |
enzymes, livestock, humus, animal tissues, public sector, biological phenomena, sexual reproduction, marketing, inorganic acid salts, adenine
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Description |
The present investigation entitled “Effect of Moisture Levels and Coated Urea Fertilizers on Release Pattern of Nitrogen in an Alfisol and Vertisol” was carried out under laboratory conditions at 35±0.5 0C with a view to study the release pattern of nitrogen from different coated urea fertilizers (NCCU, VCU, HCU, PU and Control) at two moisture levels i.e., FC and SAT, in two different soils viz., an Alfisol and a Vertisol. The transformation of N-fractions was studied to know the form in which the N is available under varying moisture levels at different days of incubation viz., 0, 1, 3, 5, 7, 10, 15, 30, 45, 60, 75 and 90 days. The experiment was conducted in completely randomized block design with factorial concept. The Alfisol was clay loam in texture, slightly alkaline (pH 7.91) in reaction, nonsaline (0.59 dS m-1) in nature and high in organic carbon (0.76 %), low in available nitrogen (200.7 kg N ha-1) and phosphorus (21.53 kg P2O5 ha-1) and high in potassium (343.8 kg K2O ha-1). The NH4 +-N and NO3 --N contents were 11.2 and 18.2 mg kg-1, respectively. Vertisol was silty clay loam in texture, moderately alkaline (pH 8.01) in reaction, non-saline (0.51 dS m-1) in nature and medium in organic carbon (0.62 %), low in available nitrogen (225.8 kg N ha-1) and phosphorus (17.86 kg P2O5 ha-1) and high in potassium (548.8 kg K2O ha-1). The values of NH4 +-N and NO3 --N contents found to be 15.4 and 23.8 mg kg-1, respectively. The different coated urea fertilizers were evaluated in terms of release pattern of NH4 +-N and subsequent NO3 --N formation at 0, 1, 3, 5, 7, 10, 15, 30, 45, 60, 75 and 90 days after incubation. The incubated soil samples were analyzed for their inorganic N fractions viz., NH4 +-N and NO3 --N at respective days after incubation. The results of the experiment revealed that irrespective of the coated urea fertilizers there was significantly higher amount of NH4 +-N released under SAT as compared to FC. Similarly, there was significantly higher NO3 --N release under FC as compared to SAT, in both Alfisol and Vertisol. With regard to coated urea fertilizers irrespective of the moisture levels, T4 (PU) hydrolyzed rapidly releasing highest NH4 +-N content within 7 DAI in both Alfisol (402.6 mg kg-1) and Vertisol (417.6 mg kg-1). This was followed by T3 (HCU) reaching highest NH4 +-N content at 15 DAI (406.7 mg kg-1) and 10 DAI (412.0 mg kg-1) in Alfisol and Vertisol, respectively. Whereas with NCCU and VCU, the NH4 +-N contents at 10 DAI found to be 395.3 and 389.9 mg kg-1 in Alfisol and 414.8 and 404.6 mg kg-1 in Vertisol, respectively. Nitrification of NH4 +-N to NO3 --N was rapid with PU, releasing higher NO3 --N at 45 DAI from Alfisol (327.5 mg kg-1) and Vertisol (346.5 mg kg-1) and thereafter remained more or less similar. For T1, T2 and T3 the highest NO3 --N contents were recorded at 75 DAI. The release of NO3 --N followed the order NCCU< VCU< HCU< PU. The onset of nitrification led to decrease in NH4 +-N content of the soils. The interaction effects revealed that the release of NH4 +-N was significantly slower under FC as compared to SAT. The release of NO3 --N showed a quick increase from 30 to 90 DAI, the highest values being recorded at FC. Keeping in view the release patterns and mineralization of NH4 +-N and NO3 --N in both Alfisol and Vertisol, under the two moisture levels, NCCU was identified as best coated urea fertilizer followed by VCU and HCU in maximizing the N-availability over a period of time. |
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Date |
2016-06-13T12:05:08Z
2016-06-13T12:05:08Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/67252
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Language |
en
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Relation |
D9306;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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