Studies on Nutrient Absorption of Rice Plants in Taiwan (Part 3) Nutrient Absorption of Rice Plants in Pintung and Taipei Soils with and without Compost under Different Temperatures

Abstract

Agronomic characters and nutrient absorption of rice plants, Taichung No. 65, under the following treatments were investigated using pot culture. Two temperature plots (different temperatures in two glass-house), two kinds of soils (Pingtung slate and Taipei sandstone and shale alluvial soils) and two different rates of compost (50 g per pot and no application of crude compost), thus total of eight treatments were examined in an experiment of factorial design. The high temperatures promoted plant length and heading date and increased the yields in the second crop. The high temperature also increased K contents and decreased N contents of straw. Total amounts of K absorption were generally increased by high temperatures. Kind of soil gave distinctly different characters on plant growth. Plant length was longer and tiller number was less in Pingtung soil than in Taipei soil. Plants grown in Pintung soil had more absorption of K, Si, Mn and less of N, P and Fe than in Taipei soil. It seems that Taipei soil is deficient in available Si and Mn. Effect of compost shown a significant interaction with soil on rice yield especially in the first crop. Application of crude compost shown detrimental effect to the yield in Pingtung soil while Taipei soil was beneifited by it. It is considered that some specific characters of these two soil caused different decomposition process of compost which in turn effect on crop yields.