LAND UTILIZATION AND FARMING SYSTEM IN TROPICAL DRYLAND AREA

在巴厘岛南部的武吉半岛进行了为期3年的田间试验，以研究土地利用和耕作制度对旱地耕作的土地生产力和土壤肥力的影响。完全随机区组设计包括4个处理和4个区组。4个处理包括：粮食作物的无杀甘草剂整合的土地（CT）和有杀甘草剂整合的土地（CG）;天然牧草的无杀甘草剂整合的土地（PT）和有杀甘草剂整合的土地（PG）。本试验所用土地的有机碳、全氮、速效磷和速效钾含量较低。粮食作物、天然牧草和打油草的封育23个月，不同处理的土壤pH、水分、田间持水量、有机碳、全盐、全氮、速效磷和速效钾均有不同程度的提高。土地所有权的粮食作物不仅生产粮食和块茎，但也饲料的形式秸秆;而让土地休耕天然牧场只生产饲料的草地豆科和阔叶树种。杀虫植物的整合增加了牧草供应，减少了土壤侵蚀。在粮食和饲料生产方面，CG是最好的系统，在农场收入方面，PT是最好的系统。讨论了GC和PG在反刍动物饲料整合中的作用。

A field experiment is on going for 3 years in Bukit peninsula south Bali to study the effect of land utilization and farming system on the land productivity and soil fertility of the dryland farming. The completely randomized block design consisted of 4 treatments and 4 blocks. The 4 treatments consisted of titled land for food crop without gliricidia integration (CT) and with gliricidia integration (CG) ; titled land for native pasture without gliricidia integration (PT) and with gliricidia integration (PG). the follow land used in this experiment is low in organic carbon, total N, available P and K. titling the land for 23 months for food crop, native pasture and gliricidia increased the pH, moisture, field capacity, organic carbon, total salt, total nitrogen, available P, and available K to varying degress depending on the treatments. Titling the land for food crop not only produced grain and tubers but also forage in the form straw ; while letting the land to fallow for native pasture only produce forage in the grass ground legume and broad leaf species. Gliricidia integration increase the forage supply and reduce the soil erosion. In terms of food and feed production CG is the best system, in terms of farm income PT is the best system. The role of GC and PG to supply fed for ruminant integration is discussed.