Preliminary study of the site-specific inorganic fertilization on lowland rice in Bangkalan Madura

Abstract

A preliminary study of the site-specific inorganic fertilization on lowland rice was carried out in Jambu village, Burneh District Bangkalan Regency East Java Province from March to July 2014. The experiment used a factorial split-plot design, with 5 replications. As the main plot were two varieties of lowland rice namely Inpari 4 and Inpari 10; and as a subplot was fertilization (dose level/inorganic type) based on a. existing practices (250 kg Urea + 300 kg NPK Ponska + 100 kg SP-36) b. PSTK (300 kg Urea + 75 kg SP-36 + 150 kg NPK), c. PC (150 kg Urea + 350 kg Ponska) and d. SSNM (125 kg Urea + 300 kg Ponska). The observations showed that there was no interaction effect between varieties and fertilization to the plant growth and yield. These parameters were affected significantly only by fertilization treatment. The highest weight of plotting yield and harvest yield was obtained in the fertilizer treatment of 453.62 kg/6.25 m2 and 7.26 tons' ha-1. Thus the use of assistive devices, especially the PSTK and SSNM applications were more efficient in the use of inorganic fertilizers with the yields equivalent to the existing practice by the farmers.