Effect of NPK fertilizers on alabio tuber on the shallow swampy area

English. The research was aimed to identify the effect of NPK fertilizers in relation with Ubi Alabio (Dioscorea alata (L.) yield on swamp areas. The research was conducted on shallow swamp land in Babirik, Hulu Sungai Utara, South Kalimantan, on 1993 dry season. Randomized block design used in the experiment with six replications. The treatments tested were: 1. without fertilizer (as a check); 2. 90 kg N/ha + 45 kg P2O5/ha (NP); 3. 90 kg N/ha + 45 kg P2O5/ha + 45 kg K2O/ha (NPK1) and 4. 90 kg N/ha + 45 kg P2O5/ha + 90 kg K2O/ha (NPK2). The status of N and P content of the soils were low, but K was high. The application of 90 kg N/ha and 45 kg P2O5/ha increased ubi Alabio from 28 t/ha to 38 t wet yield/ha. K fertilizer application increased the quality, diameter and length of the tuber. Addition of 45 kg P2O5/ha achieved moderately result

Indonesian. Penelitian bertujuan untuk mengetahui pengaruh pemupukan NPK dalam hubungannya dengan hasil ubi alabio di lahan rawa lebak dangkal, dilaksanakan di Desa Babirik Kabupaten Hulu Sungai Utara, Kalimantan Selatan, pada MK 1993. Percobaan menggunakan rancangan acak kelompok dengan 6 ulangan. Perlakuan yang diuji terdiri dari: 1. Tanpa pupuk (kontrol); 2. Dipupuk 90 kg N/ha + 45 kg P2O5/ha (NP); 3. Dipupuk 90 kg N/ha + 45 kg P2O5/ha + 45 kg K2O/ha (NPK1), 4. Dipupuk 90 kg N/ha + 45 kg P2O5/ha + 90 kg K2O/ha (NPK2). Lahan rawa lebak dangkal di lokasi penelitian memiliki kandungan N dan P rendah, namun kandungan hara K tergolong tinggi. Peningkatan produktivitas umbi Alabio cukup memadai dengan pemupukan 90 kg N/ha dan 45 kg P2O5/ha, dari 28 ton/ha menjadi 38 ton umbi segar/ha. Terdapat indikasi bahwa penambahan hara kalium dapat memperbaiki mutu fisik umbi, yakni meningkatkan diameter dan panjang umbi. Penambahan pupuk hingga 45 kg K2O/ha tampak memadai