Pengaruh Dosis Pupuk Majemuk K-Ca-Mg-S terhadap Pertumbuhan dan Produksi Dua Varietas Kedelai (Glycine max (L.) Merril) Berbiji Besar dan Kecil

Abstract

Efforts can be made to increase soybean productivity by improving cultivation such as variety selection and the use of compound fertilizers containing K-Ca-Mg-S nutrients that can support plant growth and production. This study aims to determine the effect of applying several doses of K-Ca-Mg-S fertilizer on two soybean varieties. This research was conducted at Jalan Bunga Kenanga, Padang Bulan Selayang II, Medan Selayang Subdistrict, Medan with an altitude of ±25 meters above sea level from July to October 2023. This study used a Factorial Randomized Block Design consisting of 2 factors and 3 replications. The first factor is soybean varieties namely Devon 1 and Dering 1, the second factor is the dose of K-Ca-Mg-S compound fertilizer consisting of 0; 0,5; 1; and 2,1 (g/polybeg). The results showed that Devon 1 and Dering 1 varieties differed in terms of plant height, flowering age, harvest age, number of productive branches, number of pods, seed weight and 100 seed weight. The Devon 1 variety has a higher plant height, number of pods, seed weight and 100 seed weight, the Dering 1 variety has a faster flowering and harvesting age and a higher number of productive branches, while both have no effect on total leaf area, crown dry weight, root dry weight and chlorophyll. Application of K-Ca-Mg-S fertilizer at a dose of 2.1 g/polybeg had a significant effect on the number of pods and seed weight. The interaction of variety and dose of K-Ca-Mg-S fertilizer had no significant effect on all observation parameters.