National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment was carried out during Kharif season at the Instructional Farm, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala for assessing the effect of flag leaf nutrition (FLN) on the physiological response of rice, with PTB 52 (Aiswarya) as the test variety. Leaf area duration was observed to be longest with FLN of calcium nitrate @ 0.5 per cent and was at par with all nutrient sources except potassium nitrate. Spraying a combination of calcium nitrate, magnesium sulphate and 19:19:19 complex @ 0.5 per cent (S5) recorded the highest specific leaf weight at flowering (2.11 g m-2) and foliar spraying of 19:19:19 complex @ 0.5 per cent (2.58 g m-2) recorded the highest value at harvest stage. Flag leaf nutrition with potassium nitrate at booting stage (s1g1) was significantly superior in terms of specific leaf weight (2.57 g m-2), relative growth rate and net assimilation rate. Highest chlorophyll was with 19:19:19 complex and carotenoid with potassium nitrate @ 0.5 per cent. Magnesium sulphate @ 0.5 per cent concentration (S3) recorded the maximum total soluble protein (1.04 mg g-1) at booting stage and was at par with S2 (calcium nitrate) and S4 (19:19:19 complex). The study revealed that KAU POP recommendation for high yielding medium duration wetland rice (FYM @ 5 t ha-1 + 90:45:45 kg NPK ha-1) supplemented with flag leaf nutrition of potassium nitrate or 19: 19: 19 complex @ 0.5 per cent concentration, 5 days prior to booting and 50 per cent flowering stages elicited significantly superior physiological response in lowland rice.
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