Effect of Upland Irrigation Culture on Mineral Composition of Upland, Lowland and Their Hybrid Brown Rice

Abstract

Investigations have been carried out to determine the difference between upland culture by intermittent irrigation after nearly young panicle formation stage and lowland culture on the ash, phosphorus, potassium, magnesium, manganese and iron contents of brown rice of 20 varieties each of upland rice and lowland rice and 14 varieties of their hybrid rice. The upland culture, as compared with the lowland culture, gave significantly low manganese content and high iron content of the upland, lowland and hybrid brown rice on dry matter basis. Further, the upland and lowland brown rice by the upland culture had significantly higher ash, phosphorus, potassium and magnesium contents on dry matter basis than those by the lowland culture. With regard to the minerals in ash, the upland culture gave significantly low manganese and magnesium contents of the upland, lowland and hybrid brown rice and also low potassium content of the upland and hybrid brown rice and high iron content of the hybrid brown rice in comparison with the lowland culture.