Dampak Pengelolaan Sawah Secara Organik Lebih Dari Lima Tahun Terhadap C-Organik Tanah dan Ketersediaan Ammonium

This study aims to examine the availability of soil organic C, ammonium and dynamic pattern C in organically managed paddy soils for 8 10 years at three different lowland rice locations Yogyakarta. The research was conducted using survey techniques descriptive methods. results showed that fields were given fertilizer 8-10 had higher than non-organic fields, namely an average 2.10-2.70%. In also a significant positive relationship between NH4+-dd MS containing clay minerals 1:1 (r= 0.71) NK 0 .64) PB 0.77) which dominated by 2:1. correlation not fields. Keywords ：paddy soils, C,NH4+-dd