Browsing by Author "RAVIKUMAR, A"
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ThesisItem Open Access PERFORMANCE OF SILKWORM HYBRIDS AS INFLUENCED BY DIFFERENT SOURCES OF NITROGEN TO MULBERRY(University of Agricultural Sciences GKVK, Banglore, 2004-03-08) RAVIKUMAR, A; T.K. NARAYANASAWAMYNo AbstractThesisItem Open Access PRODUCTIVITY AND QUALITY OF RICE AS AFFECTED BY INTEGRATED USE OF NITROGEN(ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD, 2004) ANNY MRUDHULA, K; RAVIKUMAR, AA field experiment was conducted during kharif, 2003 on sandy clay loam soil of Agricultural College Farm, Bapatla to evaluate the productivity and quality of rice as affected by integrated use of nitrogen sources. The pH of the soil was 8.13 with low available nitrogen (188 kg N ha-1). The experiment was laid out in a randomized block design with ten treatments and replicated thrice. The treatments consisted of control i.e., no nitrogen (T1), 100% recommended dose of nitrogen (RDN) through urea (T2), 100% RDN through FYM (T3), 100% RDN through pressmud (T4), 50% RDN through urea + 50% RDN through FYM (T5), 50% RDN through urea + 50% RDN through pressmud (T6), 75% RDN through urea + 25% RDN through FYM (T7), 75% RDN through urea + 25% RDN through pressmud (T8), 100% RDN through urea + 25% RDN through FYM (T9) and 100% RDN through urea + 25% RDN through pressmud (T10). Results of the investigation revealed that the growth parameters of rice were significantly influenced by various treatments. The maximum plant height (107 cm), number of tillers (383) and drymatter accumulation (14501.8 kg ha-1) were obtained with 100% RDN through urea + 25% RDN through FYM (T9), which was statistically on a par with 100% RDN through urea + 25% RDN through pressmud (T10) and 75% RDN through urea + 25% RDN through FYM (T7). The lowest values with regard to the said growth parameters were registered in control treatment. Yield components like number of panicles m-2, panicle length, number of spikelets per panicle, number of filled grains per panicle and 1000-grain weight were the highest in T9 treatment i.e., 100% RDN through urea + 25% RDN through FYM. Significantly higher grain and straw yields (5417 and 6775 kg ha-1) were recorded by the combined use of fertilizer nitrogen and FYM i.e., 100% RDN through urea + 25% RDN through FYM (T9) and it was on a par with 100% RDN through urea + 25% RDN through pressmud (T10) and 75% RDN through urea + 25% RDN through FYM (T7). Similar trend was also observed in case of harvest index, protein content and N uptake also. Significantly better quality parameters of rice such as head rice recovery (67.7%), volume expansion ratio (4.0), iron (25 ppm) and zinc (25 ppm) contents were registered by the application of 50% RDN through urea + 50% N through FYM and it was on a par with 50% N through urea + 50% RDN through pressmud (T6), 100% N through FYM (T3) and 100% RDN through pressmud (T4).