Budidaya Pakchoy (Brassica rapa L.) di Lahan Tailing Pasir Bekas Penambangan Timah dengan Amelioran Pupuk Organik dan Pupuk NPK Pakchoy (Brassica rapa L.) Cultivation in SandyTailings of Tin Post- MiningSite with Organic Manure and NPK Fertilizer Ameliorant

The objectives of this research are to study of the feasibility of using the sandy tailingsfor pakchoy (Brassica rapa L.) cultivation, to study the effect of organic manure and NPK fertilizer ameliorants to growth and yield of pakchoy, and to get theoptimum dosage of the organic manure and NPK fertilizer for pakchoy cultivation in sandy tailings of tin postmining. This research was conducted insandy tailingssite which has been 27 th years old after mining, in Pemali Village Bangka District, on Mei 20013 to Juli 2013. This research used factorial randomized completelely block design with two factors andthree replications. The first factor is organic manure dosage (15; 30; 45 ton.ha -1 ) and the second one is NPK fertilizer dosage (200; 250; 300 kg.ha -1 ).The results that the sandy tailings of tin post-mining is feasible to pakchoy cultivation. Organic manure dosage affected the growth and production of pakchoy, and dosage of 30 ton.ha -1 of organic fertilizer give the