THE EFFECT OF REDUCING INORGANIC FERTILIZER BY APPLYING BIODIVE FERTILIZER ON THE GROWTH AND YIELD OF SWEET CORN ON PEATLAND

Abstract

Sweet corn production in Indonesia is relatively low, namely 8.31 tonnes/ha with large market opportunities. With this, increasing sweet corn production can be done by means of inorganic and biological fertilization. This research was carried out at the location of Jalan Infrastruktur Gg. Untan Racana. This research was carried out from 14 June to 27 August 2023. This research aims to (1) Find out the interaction of the use of inorganic fertilizers and biological fertilizers on the growth and yield of sweet corn on peatlands (2) Get the best interaction doses of inorganic fertilizers and biological fertilizers on the growth and yield of sweet corn in peatlands. This research used a completely randomized factorial design (RAK) consisting of 2 factors, each factor consisting of 3 treatments, 3 replications and 4 sample plants with a total of 486 plants. The first factor is the application of inorganic fertilizer (a) consisting of 3 levels, namely: a1 (300 kg Urea/ha, 150 kg SP-36/ha, 100 kg KCl/ha), a2 (225 kg Urea/ha, 112.5 kg SP-36/ha, 75 kg KCl/ha) and a3 (150 kg Urea/ha, 75 kg SP-36/ha, 50 kg KCl/ha). The second factor is the provision of biological fertilizer (p) consisting of 3 levels, namely: p1 (45 kg/ha ≈ 0.84 g/plant), p2 (60 kg/ha ≈ 1.13 g/plant) and p3 (75 kg /ha ≈ 1.41 g/plant). The variables observed in this study included: plant height at 2, 3, 4, 5, and 6 WAP (cm), number of leaves (strands), plant dry weight (g), leaf area (cm2), root volume (cm3) , weight of cobs with husks (g), weight of cobs without husks (g), length of cobs (cm), cob diameter (cm), weight of cobs / plot (g), harvest index. The supporting variables are temperature (oC), air humidity (%), soil pH and rainfall (mm). Observation data were analyzed statistically using variance (F test at 5% level). If the F test shows that there is a real effect, then proceed with the DMRT Test (Duncan's Multiple Range Test) at the 5% level. The research results show that the interaction between inorganic fertilizer at 75% recommended dose is equivalent to (Urea 4.2 g/plant, SP-36 2.11 g/plant, KCL 1.41 g/plant) and biological fertilizer at a dose of 60 kg/ha is equivalent to with 1.13 g/plant showing the best plants and results on peat soil.