Dynamics of applied nitrogen in acidic soils of Kuttanad
By: Liji John.
Contributor(s): Thomas J (Guide).
Material type:
BookPublisher: Vellanikkara Department of Agronomy, College of Horticulture 1987DDC classification: 630 Online resources: Click here to access online Dissertation note: MSc Abstract: The present study on ‘dynamics of applied nitrogen in acidic soils of Kuttanad (Karappadadom soil)’ was conducted at the College of Horticulture, Vellanikkara, Trichur from January 1986 to December, 1986. A total of six materials viz., urea, ammonium sulphate, neem coated urea, neem coated ammonium sulphate, gypsum coated urea and rock phosphate coated urea were used as N sources. The experiment included limed and ulimed treatments of these sources at two moisture regimes.
The results of the study proved that the rate of nitrification was very low in Karappadom soil and that there was no appreciable conversion of NH + 4 – N to NO -3 N. It also showed that the coated fertilisers performed better than the uncoated fertilisers in this soil.
EC and PH of the soil increased on submergence. Eh and PH of the soil were negatively correlated.
Data on various growth and yield characters of the rice variety Jyothi showed that, nitrogen recovery was higher with coated fertilizers than with uncoated fertilisers. Rock phosphate coated urea gave maximum grain yields, however in the presence of lime its efficiency was reduced drastically.
| Item type | Current location | Call number | Status | Date due | Barcode |
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Theses
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KAU Central Library, Thrissur Theses | 630 LIJ/DY (Browse shelf) | Available | 171079 |
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MSc
The present study on ‘dynamics of applied nitrogen in acidic soils of Kuttanad (Karappadadom soil)’ was conducted at the College of Horticulture, Vellanikkara, Trichur from January 1986 to December, 1986. A total of six materials viz., urea, ammonium sulphate, neem coated urea, neem coated ammonium sulphate, gypsum coated urea and rock phosphate coated urea were used as N sources. The experiment included limed and ulimed treatments of these sources at two moisture regimes.
The results of the study proved that the rate of nitrification was very low in Karappadom soil and that there was no appreciable conversion of NH + 4 – N to NO -3 N. It also showed that the coated fertilisers performed better than the uncoated fertilisers in this soil.
EC and PH of the soil increased on submergence. Eh and PH of the soil were negatively correlated.
Data on various growth and yield characters of the rice variety Jyothi showed that, nitrogen recovery was higher with coated fertilizers than with uncoated fertilisers. Rock phosphate coated urea gave maximum grain yields, however in the presence of lime its efficiency was reduced drastically.
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