DIFFERENT DURATION RICE (Oryza sativa L.) VARIETIES AS INFLUENCED BY VARIED LEVELS OF NUTRIENTS APPLICATION UNDER IRRIGATED ECOLOGY
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Date
2018
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
In order to evaluate the performance of rice cultivars with the application of different nutrient levels, the present investigation entitled “Different duration rice (Oryza sativa L.) varieties as influenced by varied levels of nutrients application under irrigated ecology” was conducted during kharif 2017 at ICAR- Indian Institute of Rice Research (IIRR) farm, Rajendranagar, Hyderabad. The soil of the experimental field was clayey in texture (Vertisols). The soil was neutral in reaction and medium in fertility levels having available nitrogen, phosphorus and potassium content were low, high and medium,respectively. The climate of the region is semi-arid with an average rainfall of 900 mmwhere during crop growth period 722.3 mm total rainfall was received during entire crop growth duration.
In experiment, treatments comprised of three nutrient levels viz. F1: 50% RDF, F2: 100% RDF and F3:150% RDF in main plots and in sub plots with the six different duration rice varieties of DRR-Dhan 44 and DRR-Dhan 46 with the duration of 110 days, MTU-1010 and Varadhan having 125 days duration and Sugandhamati and Swarnadhan with 145 days duration were tested in split-plot design with three replications.
The findings ongrowth parameters of rice viz. plant height, numberof tillers plant-1, leaf area and leaf area index, chlorophyll content,dry matter accumulation were significantly increased with the application of 150% RDF (F3) as compared to 100% or 50% RDF. Similarly application of 100% RDF found that significantly superior than that of 50% RDF. The nutrient levels with respect to lodging score,lodging of the rice plants noticed with application of 150% RDF. As in case of treatment with the application of 50% and 100% RDF lodging score found to be zero. As regards to yield attributes and yield, application of 150% RDF produced highest yield attributes like effective tillers, number of filled grains and test weight.Thus increase in yield attributes results in increased yield of rice crop. The increase in grain and straw yield of rice crop observed more significantly with the application from 50% to 100% RDF as compared to application of nutrients from 100% to 150% RDF, but higher yields are recorded with the 150% RDF application. Similar trend was followed in harvest index and economics also. Application of 150% RDF produce the more gross, net returns and B:C ratio but more significant results were noticed with the 50% to 100% RDF application. As per the results obtained more available plant nutrients, nutrient content and nutrient uptake by both grain and straw was more with the application of more nutrients i.e 150% RDF.
The obtained results of rice verities with respect to growth parameters variety Swarnadhan produced significantly higher number of tillers, total drymatter production, leaf area and leaf area index but the plant height was recorded hieghest with the variety Sugandhamati but it was par with Swarnadhan. The variety Varadhanproduced significantly higher number of grains panicle-1, test weight, weight of the panicle and produced lower sterility percentage. Thus it produced highest grain yield. Similar trend was followed in harvest index also vardhan produced more harvest index significantly. The variety Swarnadhanproduced higher straw yield because of it produced more number of tillers, accumulation of more drymatter that results produce more straw yield. As regards to the straw content and uptake of nutrientswas observed was variety Swarnadhanwhere as the variety Varadhan noticed higher values of nutrients content and uptake by grain. Regarding quality parameters viz. milling and head rice recovery was significantly highest recorded with the variety Varadhan , as in the case of hulling, the varieties influenced non-significantly.Similar trend was followed in gross, net returns and B:C ratio the highest values are noticed with the Varadhan. Among the rice varieties the cost of cultivation was more with the Sugandhamati due to its higher seed cost and the remaining varieties were having with the similar value of cost of cultivation due to the same value of seed cost.
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