酸性紅壤上施用石灰磷肥及預先浸水對水稻生長及產量的影響(二)

Abstract

本實驗乃繼前一實驗為探求增加石灰施用量是否能使水稻增產。 本實驗水稻生長期內(12月~3月)氣溫較前一實驗(8月~11月)為低，而土壤的還原也顯然進行較慢。 石灰之無效及磷肥之顯著效果在此又獲證明，唯預先浸水在本實驗中却顯著地減低了稻谷的產量。 To find out whether increasing the rate of liming would produce a response, another experiment was carried out on the same soil in the pots of the previous experiment during December 1967-March 1968. The greenhouse set up, the soils, P addition and the procedures were the same as in the first experiment, except for the following: (1) 3.0 and 6.0 tons per hectare CaCo3 were added to the L1 and L2 treatments of the previous experiment; (2) the periods of pre-submergence were 2 and 4 weeks.