Validating fertilizer recommendation of swamp soil test kit

Abstract

Soils in riparian swampland are considered marginal and have low nutrient contents. A research on the validation of fertilizer recommendations as a complement to Swamp Soil Test Kit (PUTR) was carried out on shallow inland swamps in Sungai Ambangan Village, Sungai Raya District, Kubu Raya Regency, West Kalimantan, during dry season of 2017. The treatments consisted of 1) complete control; 2) NPK local recommendations; 3) 1 1/2; of NPK PUTR recommendation + Dolomite; 4) NPK PUTR recommendation + Dolomite; 5) 2/3 of NPK PUTR recommendation + Dolomite; and 6) NPK of local farmer’s recommendation. Results using PUTR and laboratory equipment showed acidic soils with low to medium nitrogen, medium to high P, and low potassium. Validation showed that highest number of productive tillers was found in treatment of 1 1/2; of NPK PUTR recommendation + Dolomite. Plant height showed that there was insignificant difference between treatment with NPK local recommendation, 1 1/2; of NPK PUTR recommendation + Dolomite, NPK PUTR recommendation + Dolomite, 2/3 of NPK PUTR recommendation + Dolomite. This was similar to results of harvested dry grain and harvested grind grain. Utilization of PUTR as rapid test tool can be implemented for ricultivation on riparian swampland. Impact of fertilization obtained neck blast attack increased along with the rise of fertilization dose, especially nitrogen.