Different Cultivation Techniques on Macronutrient Utilization of Lowland Rice on Acid Sulfate Soil for Sustainable Production

摘要

This study aimed to compare different cultivation techniques and plot levels on macro nutrient utilization of lowland rice grown on acid sulfate soil for sustainable production. Cultivation technique (Modified Cultivation (MC) technique and Conventional Cultivation (CC) technique) and plot level (upper plot and lower plot) were experimental factors. Under MC technique, farmer applied 187.5 kg ha^-1 of compound fertilizer (16-20-0) and 18.75 kg ha^-1 of KCl (0-0-60) at planting, incorporated the previous rice stubble, transplanted rice seedlings and followed 2 weeks flooding and 1 week completely drainage system. Under CC technique, farmer applied 312.5 kg ha^-1 of 16-20-0 compound fertilizer at planting, burned the previous rice stubble, broadcasted rice seeds and followed continuous flooding throughout the growing period. Upper plot was directly irrigated from drainage canal and lower plot was irrigated with the drained water from upper plot. Compared with CC technique, MC technique improved soil macronutrients content, especially N and P improving utilization of those nutrients by rice plant. Utilization of most macronutrients by rice was not statistically affected by plot level. It was suggested that farmers should follow MC technique to meet higher macro nutrient utilization of lowland rice for sustainable production under acid sulfate soil.