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Birsa Agricultural University, Ranchi

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19821
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Subject: Agricultural Engineering × End date: 1989 × Start date: 1982 × Type: Thesis ×
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    ThesisItemOpen Access
    Urea Fertilizers And Their Management Practices For Lowland Rice
    (Birsa Agricultural University, Ranchi, 1982) Ganesh Prasad Saha; B. N. Mitra
    Based upon the finding of experiments summarized above, it may be concluded that there is considerable possibility in the improvement of grain yield and N content in grain of lowland rice by growing improved varieties with suitable from of urea and their appropriate N management practices .For a long duration variety like Pankaj ,application of LCU as single basasl or in two equal splits at an interval of 30 days can increase the yield considerable .For a short duration variety like Pusa 33, a high level of production can be expected even with OU if applied in two equal splits particularly the basal half by plough sole method. A medium duration variety like Ratan whose N requirement is moderate ,split application .In the soils of medium fertility , 54 KgN/ha is adequate to achieve high yields as well as recovery during wet season. The results further suggest that a high yield variety even of moderate N requirement if grown during dry season is necessarily to be supplied with higher level of N as compared to wet season. Under continuous flooded conditions –Common feature of lowland, application of LCU is more promising than other indigenous from of urea for increasing the yield as well as recovery of N. This also holds true for irrigated lowlands, where wet season rice is mostly followed by a dry season rice. Application of OU by broadcast –incorporation is to be avoid as far as possible and , insect, plough sole method may be adopted after 3-5 days of puddling or just before transplanting. For obtaining good response with USG placement in two equal splits at planting and at 30DAT is most appropriate and single basal placement in higher dose if necessarily to be avoided. Under limited supply of N, even with 27 Kg N/ha, high yield can be expected if aslow releases form like LCU is applied in place of other comparatively fast- releasing forms. In soils where leaching loss of N is considerably low, USG may prove to be as good as slow release forms like LCU. Both these forms, being indigenous, hold promise to the present day lowland rice cultivation where sustained efforts are being made extensively to improve the utilization of N from Urea.