Sifat Kimia Tanah, Populasi Bakteri Pelarut Fosfat, dan Hasil Cabai pada Aplikasi beberapa Jenis Mulsa pada Inceptisol, Ngemplak, Boyolali

Mulch was often applied on chili pepper cultivation. It aimed to cover the soil from various factors which can reduce the yield. This research aims to study the effect of various type of mulch (silver-black plastic and straw) to soil chemical properties, population of PSB, and chilli pepper yield (harvest time, weight of dry plant biomass, and weight of fresh fruit per plant), also to study the correlation between the population of PSB with chilli pepper yield. The research has been conducted on December 2015 until October 2016, on inceptisol field in Ngemplak, Boyolali. The variables of this research are soil properties (pH, organic-carbon, total-N, available-P, and exchanged-K), total-PSB, and chili pepper yield (harvest time, the weight of dry plant biomass, and weight of fresh fruit per plant). The result showed that various type of mulch application significantly increased soil-pH, increased soil total-N, soil available-P, total-PSB, the weight of dry plant biomass, the weight of fresh fruit per plant, and fastened harvest time. It also tends to increase soil organic-carbon and soil exchanged-K. There were strong correlations between total-PSB and harvest time, the weight of dry plant biomass, and weight of fresh fruit per plant. The best result showed by silver-black plastic mulch application. Key words: Available-P, biomass, fertility status, silver-black plastic, stra