Rekomendasi Pengelolaan Hara N, P dan K Spesifik Lokasi Lahan Agroforestri Kopi Desa Rowosari Kecamatan Sumberjambe Kabupaten Jember dengan Sistem Informasi Geografis

Abstract

Agroforestry is a form of cultivation that combines agricultural crops with forest crops for sustainable land use. Robusta coffee is an agricultural commodity that can be grown in agroforestry systems. The availability of NPK macro-charge elements is an influential factor in the productivity of coffee crops. Therefore, site specific fertilization can be applied as the fulfilment of the needs of the farm with the concept of environmental conservation and ecosystem sustainability. GIS is a solution to obtain information on the availability of coffee land status accurately and efficiently, so that fertilization is carried out correctly. Sample point determination using a grid sampling method and IDW interpolation is done to determine the distribution of soil chemical properties. The results of the study showed levels of N-total and P-provided in very low to low categories, K recommended in medium to high categories and more acidic to neutral pH. The value of the NPK element is influenced by many factors. This is demonstrated by the R2 value of the correlation between the pH with the NPK element is very weak. The pH value of R2 against the total N is 0.029, which means only 2.9% of the total value of N is affected by the pH. The recommended fertilization that can be given to a coffee plant is 10 kg/tree/year.