PG Thesis

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Has files: YesSubject: search.filters.subject.Mineralisation of urea

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    Release of nitrogen and potassium from root contact packets of urea and muriate of potash and their crop responses
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1992) Jomol P Mathew; Vikraman Nair, R
    The present study 'release of nitrogen and potassium from root contact packets of urea and muriate of potash and their crop responses was conducted during June 1991 to June 1992 at the College of Horticulture, Vellanikkara. Root contact packets of varying porosities and quantities were prepared and separate experiments were conducted to study the efficiency of packets of urea and muriate of potash. A series of experiments were conducted to standardise the porosities suited to provide extended potention of the fertiliser packed in polythene packets. In studies conducted in north-east monsoon season, substantial retention of muriate of potash could be observed with porosities of one and two nuil holes cm-2 upto 90 days of application . The quantity retained was found to decrease significantly with increase in porosity.
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    Possibilities of using unsymnetrlcal Diaethyl urea as Urease/Nitrification inhibitor for Increasing the efficiency of nitrogenous fertilisers
    (Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, 1988) Asha Varughese; Babukutty, K
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    Possibilities of using unsymmetrlcal dimethyl urea as Urease/Nltrlflcatlon inhibitor for Increasing the efficiency of nitrogenous fertilizers
    (Department of soil science and agricultural chemistry, College of Agriculture, Vellayani, 1988) Asha Varughese
    An Investigation was carried out at the College of Agriculture, Vellayanl, during the first crop season of 1987 to study the efficacy of the use of unsymmetrical dimethyl urea (UDMU) and neemcake (NC) In various combinations as urease/nitrification inhibitors for increasing the nitrogen use efficiency in wetland rice soils of Kerala. The initial analysis of the basic physico-chemical properties of the soil from the experimental site was done. UDMU was applied along with urea as mixed and in the coated form. Two levels of UDMU. via, 1/10th and 1/5th of the quantity of area were used for study. Neemcake was added at the rata of 40 kg/ha. Soil samples were withdrawn periodically from the experimental plots and analysed to the laboratory for estimating urea N, NH4 No2-N and contents in order to study tbs rate of mineralisation of urea. The experiment was carried out in a simple randomised block design with ten treatments and three replications