A water recirculation system for the cultivation of Oryza sativa L. at Sumedang, Indonesia

Main Article Content

E. Widiasri
B.K. Gaib
D. Karnia
R.J. Putri
I.C. Adilaksono
D. Nofitasari
R. Manurung
M.Y. Abduh

Abstract

The influence of water input and recirculation systems towards biomass production of Ciherang paddy was investigated. Sixteen containers containing the seedlings of Ciherang paddy (age of 9 days) were cultivated in a screen house at Jatinangor with the irradiance of 9–14 MJ/m2, the temperature of 27–29°C, the relative humidity of 72–75%, and the wind speed of 0.4–0.6 m/s. The plants were subjected to 5 different treatments; P0 and PI: without water recirculation and a 50% shading net with a different water input of 1,200 mL/day for P0 and 810 mL/day for PI, PII: without water recirculation and with a 50% shading net and water input of 750 mL/day, PIII: with water recirculation and with a 50% shading net and water input of 1,500 mL/day, and PIV: without water recirculation and a 50% shading net but with additional air circulation and additional humidity and water input of 800 mL/day. After 114 days of cultivation, the plants were harvested and analyzed in terms of rice growth, productivity of rice biomass, nitrogen content in the biomass, and evapotranspiration rate. At the end of the cultivation period, the best results were obtained for PIII with an average plant height of 103 cm, 131 leaves, 36 tillering, and 29 panicles/plant. The average water holding capacity for PIII varies from 553–4,532 mL with an average evapotranspiration rate of 93–253 mL/day. The plant biomass was 276.1 g on a dry basis with a water content of 38.9% and total nitrogen content of 3.2 g, with an estimated rice productivity of 0.11 kg/m2. The average amount of excess water for the recirculation system was 1,086 mL/day and the total nitrogen content in the excess water was 6 mg/day.

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References

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