Increasing ultisol productivity by rice straw and K fertilizer addition in Jambi
1997
Mulyadi (Instalasi Penelitian dan Pengkajian Teknologi Pertanian Yogyakarta (Indonesia)) | Purnomo, J. | Sukristiyonubowo
Experiment was conducted on Ultisol at transmigration area of Kubang Ujo Jambi 2 seasons, Jambi. The aim of the study was to evaluate the proper rate of straw and KCl fertilizer to sustain of soil and crop productivities. The research used factorial randomized complete block design with three replications. The first factor was three levels of straw application: 0, 5 and 10 t straw/ha, respectively. The second factor was 5 levels of KCl: 0, 20, 60, 80 and 160 kg KCl/ha, respectively. As basal fertilizer was 100 kg urea/ha, 200 kg TSP/ha, and 2 ton lime/ha. Soybean (variety Wilis) was used as an indicator crops. The result showed that the soil management without addition organic matter and K fertilizer decreased organic matter, K content and soybean yield. Application of straw 5 to 10 t/ha could maintain organic matter, available K content and minimize of K fertilizer demand. Fertilization of potassium was needed if exchangeable K content in the soil was 0.20 me/100 g soil. To achieve and sustain of high soybean yield, at least 5 t/ha organic matter and 80 kg KCl/ha were added
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