AGRONOMIC ASSESSMENT OF DIFFERENT RICE HYBRIDS FOR SUSTAINABLE PRODUCTION THROUGH AGRONOMIC MANIPULATION UNDER HIGH RAINFALL CONDITIONS OF KONKAN
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Date
2017-05
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dbskkv., Dapoli
Abstract
Two years research experiment was conducted during Kharif season of 2015 and 2016 to investigate the, “Agronomic assessment of different rice hybrids for sustainable production through agronomic manipulation under high rainfall conditions of Konkan” at Agronomy Farm, College of Agriculture, Dapoli, Dist. Ratnagiri (M.S.). The soil of the experimental plot was clay loam in texture, moderately acidic in reaction, high in organic carbon content. It was medium in available nitrogen, low in available phosphorus and fairly high in available potassium during the both years of experimentation.
The field experiment was laid out in split-split plot design comprising 48 treatment combinations replicated thrice. Main plot treatment consisted of four sowing times viz., 23rd meteorological week (4th to 10th June) (S1), 25th meteorological week (18th to 24th June) (S2),
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27th meteorological week (2nd to 8th July) (S3) and 29th meteorological week (16th to 22th July) (S4). The sub plot treatment consisted of four rice hybrids i.e. Sahyadri (H1), Sahyadri 3 (H2), Suruchi 5401 (H3) and PA 6444 (H4) while, sub-sub plot treatment comprised of three age of seedling, viz., 15 days old seedling (A1), 30 days old seedling (A2) and 45 days old seedling (A3).
During the course of present investigation, periodical growth observations, yield contributing characters and yield were recorded to evaluate the treatment effects. The concentration of nitrogen, phosphorus and potassium and its uptake by the rice hybrids was studied. The effect of agroclimatic indices on physiological stages of different rice hybrid was studied. Economics of the treatment combinations was also worked out.
The experimental results revealed that rice crop sown in 23rd meteorological week (4th to 10th June) recorded significantly higher growth as well as yield attributes resulting into significantly higher grain and straw yield over the rice hybrids sown in 25th meteorological week (18th to 24th June), 27th meteorological week (2nd to 8th July) and 29th meteorological week (16th to 22nd July). The quality parameters protein content in grain and straw were significantly more under sowing in 23rd meteorological week. However, significantly higher values of N, P and K uptake recorded with rice sown in 23rd meteorological week (4th to 10th June) than rest of sowing times. The available status of nitrogen, phosphorus and potassium after harvest of experimental crop was significantly higher in sowing 29th meteorological week (16th to 22nd July) compared to other sowing times. The rice hybrids sown in 23rd meteorological week recorded highest gross monetary returns of ₹ 1,48,632, ₹ 1,29,842 and ₹ 1,39,237 ha-1, net monetary returns ₹ 53,030, ₹ 37,372 and ₹ 45,201 ha-1 and benefit to cost ratio of 1.55, 1.40 and 1.48 during the years 2015, 2016 and pooled mean respectively.
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Among the rice hybrids Sahyadri 3 found to be significantly superior for all the growth parameters and most of the yield attributing characters than rest of hybrids except PA 6444 under the investigation. The grain yield, straw yield and quality parameters were significantly enhanced and recorded higher values under the hybrids Sahyadri 3 than rest of hybrids and the hybrid PA 6444 was found to be at par with Sahyadri 3 during both the years. The highest values of N,P,K content and uptake of nitrogen, phosphorus and potassium were noticed under the hybrid Sahyadri 3. Similarly, the values of available nitrogen, phosphorus and potassium were significantly higher under the hybrid Suruchi 5401 (H3) over rest of hybrids during the year 2015 as well as 2016.
Significantly the highest gross monitory returns of ₹ 1,12,564, ₹ 96,389 and ₹ 1,04,477 ha-1, net monitory returns of ₹ 26,421, ₹ 12,923 and ₹ 19,672 ha-1 and B:C ratios of 1.27, 1.12 and 1.19 registered under the hybrids Sahyadri 3 during both years of experimentation and in the pooled mean, respectively.
The transplanting of rice hybrids 15 days old seedling (A1) recorded the higher growth attributes which were significantly higher as compared to the rest of the age of seedling. Yield attributing characters were also significantly higher under 15 days old seedling as compared to all other age of seedling. The grain yield, straw yield and quality parameters were significantly enhanced and recorded higher values under the 15 day old seedling than over 30 and 45 days old seedling during both the years. The highest values of N,P,K content and uptake of nitrogen, phosphorus and potassium were noticed under the 15 days old seedling. The values of available nitrogen, phosphorus and potassium content of soil after harvest of crop were higher in 45 days old seedling than other age of seedlings.
Maximum gross returns of ₹ 1,16,281, ₹ 1,01,157 and ₹ 1,08,719 ha-1 and net return ₹ 27,322, ₹ 14,692 and ₹ 21,007 ha-1 and B: C ratios of 1.28, 1.14 and 1.21 were obtained when crop was
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transplanted with 15 days old seedling during year 2015, 2016 and in case of pooled mean respectively.
All the growth parametters, yield attributes, yield, quality and uptake were significant higher when hybrid rice Sahyadri 3 was sown in 23rd meteorological week (4th to 10th June) and transplanted with 15 days old seedling. In respect of economics of different treatment combinations the treatment combination of crop sown during 23rd meteorological week with 15 days old seedling along Sahyadri 3 hybrid (S1H2A1) recorded maximum values of gross returns (₹ 1,60,647, ₹ 1,45,482 and ₹ 1,53,065 ha-1) net returns were are (₹ 65, 311, ₹ 52,673 and ₹ 58,992) and B: C ratio (1.68, 1.57 and 1.62) during the year 2015, 2016 and in mean, respectively followed by treatment combination of S1H4A1.
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