Effect of irrigation and nitrogen management on water productivity and nutrient uptake of aerobic rice

Abstract

Water and nitrogen fertilizer are the two important inputs for rice cultivation. A field experiment was carried out in split plot design, with three water management treatments, irrigation at (i) 75 % Cumulative Pan Evaporation (CPE), (ii) 100% CPE, (iii) 125% CPE in the main plot, and four nitrogen management strategies, (i) 100% nitrogen applied through chemical fertiliser, (ii) 75% through chemical fertiliser + 2.5 t ha-1 vermicompost, (iii) 50% through chemical fertiliser + 5.0 t ha-1 vermicompost, and (iv) 25% through chemical fertiliser +7.5 t ha-1vermicompost in subplot. The grain yield, straw yield, water productivity, nutrient uptake and economics of aerobic rice were considerably affected by irrigation and nitrogen management. Crops receiving irrigation at 125% CPE had the highest grain yield (3618 kg ha-1), which was comparable to crops receiving irrigation at 100 % CPE. Regardless of irrigation and nitrogen management, the straw yield of aerobic rice ranged from 4127 to 5092 kg ha-1. The highest total NPK uptake by grain was recorded with nitrogen at 100 % N through fertiliser (N1), which was significantly greater than what was obtained from other nitrogen treatments and irrigation management at 100 % CPE (I100) and 125 % CPE (I125) was significantly better than irrigation at 75 % CPE (I75). Irrigation management at 125 % CPE yielded the highest gross return, net return, and B: C ratio of aerobic rice, which was comparable to 100 % CPE and 100 % N through fertiliser, 75 % N through fertiliser + 2.5 t ha-1 vermicompost, and significantly higher than other nitrogen treatments.

Performance of Rice Varieties with Varying Irrigation Scheduling under Aerobic Condition

“…The probable reasons assigned for rice variety CR Dhan 201 produced significantly higher grain yield than all other varieties due to enhanced stature of growth and yield attribute and finally increased grain yield. This was in accordance with the findings of Duary [9].…”

Impact of Irrigation and Fertigation Levels on Growth, Yield Components and Yield of Aerobic Rice (Oryza sativa L.) under Drip System

“…The higher grain yield was recorded with might be owing to higher conducive situation for efficient water and nutrients uptake which boost their growth and yield attributes through supply of more photosynthates towards the reproductive sink. This results were in corroborates with the findings of Duary and Pramanik (2019). Lower yield was recorded during both the years of experimentation because the lowest fertility percentage observed with drip fertigation at 50% PE up to 30 DAS+100% PE up to 60 DAS+150% PE up to 90 DAS with 75% RDF (75% through NF+25% through WSF).…”

“…(2021) and Mariyappillai et al (2022). Higher number of tiller production was noted with DF at 100% PE up to 30 DAS+150% PE up to 60 DAS+200% PE up to 90 DAS with 125% RDF (25% through NF+75% through WSF) , might be due to good crop, root growth and availability of nutrients throughout growth stages which ultimately increased tiller density (Duary and Pramanik, 2019). Dry matter production increased with increased level of water and nutrients (T 9 ) due to water soluble fertilizer through fertigation resulted in continues supply of nutrients besides maintaining optimum water availability which lead to higher uptake of nutrients which in turn good soil aeration throughout crop growth period might have favored faster cell division and elongation focused ultimately increased plant height, tiller numbers, more number of leaves and leaf area development leading to maintain total dry matter accumulation.…”

Growth, Productivity and Profitability of Direct Seeded Rice as Influenced by Maize Crop Residue Management Practices and Fertility Levels in Rice-Maize Sequence

“…It was followed by 75% RDF (S ) and 50% 2 RDF (S ). This might be due to greater reserves of 3 photosynthates present in the stems of the plants receiving higher fertilizer levels which were translocated to the panicle and resulted in significant difference with the dry weight of panicle in plants with lower nitrogen applications (Duary and Pramanik 2019).…”