Model Bera dalam Sistem Agroforestri

Abstract

The development of tree-based agroforestry model gives consequences to the space utilization dominated by trees. Farmers take action on this condition by conniving the fallow land.This research was aimed to know the fallow land model, find the key parameters of fallow land model, and formulating the management of fallow land. The spatial model of agroforestry used in this research were trees along border, alley cropping, alternate rows and mixer. The actual data obtained were tree height, tree diameter, crown diameter, land width, and light intensity; the calculated data were land extent, the percentage of crown cover and crown density. The analysis used to determining the percentage of crown cover to calculate the affective arable land area was zone system. Zonation system maked for four zone : 1)zone 1 interval 0-1 m ; 2) zone 2 interval 1-2 m; zone 3 interval 2-3 m; zone 4 interval 3-4m.The fallow land model was classified into three models, which were light fallow, medium,and heavy; by using some determining factors such as land width, crown density, light intensity, and farmer’s culture. Light fallow has 62% of effective arable land from land area (zone 1: the percentage of land cover is >16%; zone 2 14%; zone 3: >7% and zone 4 >15%). Medium fallow land model has 37% of effective arable land % of arable land 62% of effective arable land (zone 1: 16% of land cover land area 26%, zone 2: 14% of land cover land area 24%; zone 3: 7% of land cover land area 11%; zone 4: 1% of land cover land area 2%). Heavy fallow land model has 37% of effective arable land from land area (zone 1: the percentage of land cover is <26%; zone 2 <24%; zone 3 11%; zone 4 <2%). The strategy of silviculture is given priority to the decreasing of crown density to increase the availability of light in order to support the culture of crops to be more optimal.