PENGARUH APLIKASI PUPUK POLYHALITE DAN KCl TERHADAP KADAR K DAN PERTUMBUHAN BIBIT TANAMAN JERUK PAMELO (Citrus maxima) DI KEBUN PERCOBAAN BALITJESTRO, BATU

Abstract

There are still many farmers in Indonesia who use a single fertilizer such as N, P, or K fertilizer. While the needs of plant nutrients are not only that nutrients but also other macronutrients. One of single fertilizer used is KCl fertilizer which only contains essential K nutrients and micro Cl nutrient elements. To overcome this problem, another source of K fertilizer that does not contain Cl is used, especially in Pamelo citrus nurseries. POLY4 fertilizer is used as a source of K nutrients, because it has an excess of containing several nutrients such as K (14%), Ca (17%), Mg (6%), and S (19%). This research was conducted at the BALITJESTRO screen house and the Soil Department Laboratory, Faculty of Agriculture, Brawijaya University. The research design used was a completely randomized design with 5 treatments i.e P0 (100% MOP), P1 (50% POLY4 + 50% MOP), P2 (100% POLY4), P3 (150% POLY4), and P4 (200% POLY4). Parameters of this research were plant height, numbers of leaf, soil pH and exchangeable K, and K content in plant. Result of this study indicated that application of 50% POLY4 + 50% MOP (642 kg ha-1 POLY4 + 150 kg ha-1 MOP) significantly affected the height and number of leaves of Pamelo orange seedlings in 12 weeks, respectively 6.39% and 13.6 % compared to 100% MOP/control (300 kg ha-1 MOP). Application of 150% POLY4 (1,927 kg ha-1 POLY4) significantly increased plant K level by 9.40% compared to control (300 kg ha-1 MOP). Application of POLY4 fertilizer had no significant effect on pH and exchangeable K. The best dose of fertilizer in Pamelo citrus nurseries is the application of POLY4 642 kg ha-1 POLY4 + 150 kg ha-1 MOP (50% POLY4 + 50% MOP).

IDENTIFIKASI DAN KEANEKARAGAMAN MAKROFAUNA TANAH DI PERKEBUNAN JERUK SIAM (Citrus nobilis) DI KECAMATAN BAYONGBONG, GARUT

“…Dikarenakan menjadi salah satu tanaman andalan Nasional Indonesia maka usaha budidaya tanaman ini perlu mendapat perhatian khusus. Selain itu, dari tingkat produksi, budidaya tanaman jeruk di Indonesia dapat dikatakan masih rendah jika dibandingkan dengan negara penghasil jeruk yang lainnya (Saraswati, et al, 2022).…”

Aplikasi Polyhalite sebagai Pengganti ZK dan Pengaruhnya terhadap Kadar K, Mg, dan S Daun, Produksi, dan Mutu Buah Jeruk Siam

“…Hal ini diduga akibat kelarutan polyhalite yang lebih lambat dibandingkan dengan garam sulfat dari K, Ca, dan Mg, sehingga membuat unsur hara tersedia secara bertahap dan lebih lama bagi tanaman (Yermiyahu et al, 2017). Hasil penelitian Suntari et al (2020) menunjukkan bahwa aplikasi 50% polyhalite + 50% KCl (642 kg/ha polyhalite + 150 kg/ha KCl) meningkatkan tinggi tanaman dan jumlah daun benih jeruk pamelo secara nyata dibandingkan dengan KCl.…”