| dc.description.abstract | The vegetative and mechanic methods are soil and water conservation technology to prevent surface run off and soil erosion as well as protect soil nutrient. The study objectives were to know silvicultural and economic aspects on combination of vegetatives between Falcataria moluccana (sengon) and Sorghum bicolor L. (sorghum) and terrace methods in a steep slope (>25-45%) and a very steep slope (>45%) lands. The silvicultural parameters measured were healthy plant, survival rate, stem diameter, and height increments of sengon trees and sorghum’ yield. The economic aspect was analyzed to calculate the cost, revenue, and
profit of the application of sorghum as intercropping plants in vegetative method. The healthy plant of sengon and sorghum reached 80-89% (good), survival rate of sengon reached 80-89% (good) and sorghum reached 90% (very good), stem diameter and height increments of sengon trees reached 2.90 cm year-1 and 2.06 m year-1, and the height increment of sorghum was 45.55 cm month-1 in the steep slope (>25-45%). In the very steep slope (>45%), healty plant of sengon and sorghum were 70-79% (moderate) and 80-89% (good), survival rate of sengon and sorghum was 80-89% (good), stem diameter and height increments of sengon were 2.43 cm year-1 and 1.73 m year-1, and height increment of sorghum was 33.05 cm month-1. Total cost,
total revenue, and profit of the vegetative (sengon and sorghum) and terrace methods combination in the steep slope (>25-45%) were Rp9,181,128.47 ha-1cs-1; Rp1,800,000.00 ha-1cs-1; and (-)Rp7,181,128.47 ha-1cs-1, respectively. In the steeper ground (>45%), this application expended total cost as much as Rp9,181,128.47 ha-1cs-1, total revenue as much as Rp650,000.00 ha-1cs-1, and profit as much as (-)Rp8,531,128.47 ha-1cs-1. Although sorghum was not profitable economically as intercropping plant in agroforestry system (sengon-sorghum) in different slope lands for short term, the method combination between vegetative (sengon-sorghum) and terrace techniques could useful to soil and water conservation as well as environmental aspect for long term. | en_US |
