The Effect of Soil Slope and Organic Materials on Changes of Land Physical Properties and Napier Grass (Pennisetum purpureum) Production

The movement of water and organic material in the hill slope area influenced by the difference of soil slope and it play an important role to contribute the spatial differences of soil properties. Therefore, this study aims to examine changes in parameters of soil physical properties on various slopes due to the provision of types of organic matter (manure, coffee skins and Gliricidia leaves). This study also analys the influence of slope soil to the Napier grass production (Pennisetum purpureum). The study was obtained in the hilly areas of Paya Tumpi Village by using a split plot organic design. In deep analysis of change in parameters on the slope of the type of organic material on soil physics will be performed. The results showed that organic various types of slope and administration of various types of organic materials significantly affected the physical properties of the soil, namely permeability, porosity, aggregate stability index, fast drainage pore, slow drainage pore, available water pore, growth and yield of Napier grass. Gliricidia leaves compost is the best for growing Napier grass.