Root Growth, Nutrient Uptake and Yield of Medicinal Rice Njavara under Different Establishment Techniques and Nutrient Sources
- 1 Department of Agronomy, TNAU, Coimbatore, India.
- 2 Department of Agronomy, TNAU, Coimbatore, India.
Abstract
Field experiments with medicinal rice Njavara were conducted at Cropping Systems Research Centre, Karamana, Thi ruvananthapuram, Kerala during summer of 2007 and 2008. The experimental design was split plot with three replica tions. The treatments consisted of four establishment techniques viz . , System of Rice Intensification SRI (M 1 ), Inte grated Crop Establishment Method (ICM) (M 2 ), Package of practices (PoP) (M 3 ) of Kerala Agricultural University and Conventional Management Practices (CMP) (M 4 ) in main plot. Three nutrient sources viz. , ( 1 ) organic, 2 ) integrated use of organic and inorganic, 3 ) chemical fertilizers only) were used under different establishment techniques. Root dry matter production was determined at weekly intervals and plant nutrients uptake was determined by calculating from the product of dry matter, straw dry weight, grain yield and percentage of nutrients. Results revealed that at early stages (4 - 6 WAT/WAS) (Weeks after transplanting/Weeks after sowing), root dry matter production hill - 1 was in the order of SRI > ICM > CMP > PoP which changed to SRI > ICM > PoP > CMP from 7 th week onwards. Maximum root dry mat ter (at 9 th WAS/WAT) was recorded in SRI (0.51/ 0.50 g . hill - 1 in 2007/2008). The total nutrients uptake (N, P, K, Fe, Mn and Zn) in conventional management practices was significantly higher than other establishment techniques. Among the nutrient sources, higher total (N, P, K, Fe, Mn and Zn) uptake by crop was recorded under integrated nu trient source than organic and inorganic sources.
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