STUDY OF SPACING MODELS AND SUPER FERTILIZATION TO INCREASE OF LOWLAND RICE PRODUCTIVITY

Abstract

This study aimed to determine the effect of spacing with super fertilization on the lowland rice growth and yield. The study was conducted in the Klagen Srampat Village, Maduran District, Lamongan Regency in DS I 2019, using rice of Inpari 42 variety in an area of 1000 m2. The study was arranged in a randomized block design for 8 treatments of spacing models and super fertilization with 4 replications, namely: (1) spacing models of super double row tight (spacing between rows is 40 cm x 5 cm x 20 cm x 5 cm and in rows 10 cm) + Agrimeth biofertilizer + organic fertilizer with M-Dec bio-decomposer, (2) spacing models of double row tight (spacing between rows is 40 cm x 5 cm x 20 cm x 5 cm and in rows 10 cm), (3) spacing models of super double row (spacing between rows is 40 cm x 20 cm and in rows 10 cm) + Agrimeth biofertilizer + organic fertilizer with M-Dec bio-decomposer, (4) spacing models of double row (spacing between rows is 40 cm x 20 cm and in rows 10 cm), (5) spacing models of super tight (20 cm x 10 cm) + Agrimeth biofertilizer + organic fertilizer with M-Dec bio-decomposer, (6) spacing models of tight (20 cm x 10 cm), (7) spacing models of super symmetric (20 cm x 20 cm) + Agrimeth biofertilizer + organic fertilizer with M-Dec bio-decomposer, and (8) spacing models of symmetric (20 cm x 20 cm). The results showed that the use of a high population of rice plants requires sufficient nutrients, therefore, complete fertilization is needed in the form of organic, inorganic fertilizers and a biofertilizer to increase grain yields. The application of the spacing model of super double row tight accompanied by the application of Agrimeth biofertilizer and organic fertilizer using M-Dec bio-decomposer obtained the best rice grain yield of 8,400 kg/ha with a profit of IDR 26,635,000 and B/C ratio of 2.39, being economically feasible.