Abstract: The continuous use of chemical fertilizers without the input of organic matter into the soil causes very serious land degradation. The input of organic matter is needed because organic material has enormous benefits for the physical, chemical and biological properties of the soil. Peanut broth is one of the agricultural wastes classified as high quality organic material because it has a high N content of 3.65%, P of 0.33% and K of 1.23% which have not been utilized optimally. This study aims to determine the efficiency of nutrient uptake of potassium and the optimum dose of compost in maize due to the application of compost from agricultural waste (peanut stover) at different doses. The study was designed using a simple completely randomized design (CRD) with 5 treatments of giving peanut stover compost: Control, D1 = dose 5 tons ha-1, D2 = dose 10 tons ha-1, D3 = dose 15 ton ha-1 and D4 = dosage of 20 ton ha-1 for each treatment was repeated 3 times and each replication consisted of 5 plant samples. The results showed that there was no significant effect between the treatment of peanut stover compost dosage on the parameters of the number of leaves and leaf area during growth, the plant height had a significant effect only at the age of 6, 7 and 8 weeks. The treatment of 15 tonnes ha-1 (D3) on root K uptake showed the highest absorption compared to other treatments at 2124.24 mg kg-1, followed by canopy and total uptake respectively 17452.81 mg kg-1 and 19577, 05 mg kg-1 at the same treatment. The highest K nutrient absorption efficiency was 5.93% in the treatment of 20 tonnes ha-1 (D4) and the optimum dose was 21.65 ton ha-1 with maize yields of 4.54 ton ha-1.

Keywords: K uptake efficiency, organic fertilizers, peanut stover, maize plants

Abstrak Penggunaan pupuk kimia terus-menerus tanpa ada masukan bahan organik ke dalam tanah menyebabkan degradasi lahan yang sangat serius. Masukan bahan organik sangat dibutuhkan karena bahan organik manfaatnya sangat besar terhadap sifat fisik, kimia dan biologi tanah. Brangkasan kacang tanah merupakan salah satu limbah pertanian tergolong bahan organik kualitas tinggi karena memiliki kandungan N cukup tinggi sebesar 3,65%, P sebesar 0,33% dan K 1,23% yang belum termanfaatkan secara optimal.  Penelitian ini bertujuan mengetahui efesiensi serapan hara unsur kalium dan dosis optimum kompos pada tanaman jagung akibat pemberian kompos dari limbah pertanian (brangkasan kacang tanah) pada dosis yang berbeda. Penelitian dirancang menggunakan Rancangan Acak Lengkap (RAL) sederhana dengan 5 perlakuan pemberian kompos brangkasan kacang tanah: Kontrol, D1= dosis 5 ton ha-1,  D2= dosis 10 ton ha-1,  D3= dosis 15 ton ha-1 dan D4= dosis 20 ton ha-1 masing-masing perlakuan diulang 3 kali dan masing-masing ulangan terdiri dari 5 sampel tanaman. Hasil penelitian tidak terdapat terdapat pengaruh nyata diantara perlakuan dosis kompos brangkasan kacang tanah terhadap parameter jumlah daun dan luas daun selama pertumbuhan, pada parameter tinggi tanaman berpengaruh nyata hanya pada umur 6, 7 dan 8 minggu. Perlakuan 15 ton ha-1 (D3) pada serapan K akar menunjukkan serapan tertinggi dibanding perlakuan yang lain sebesar 2124,24 mg kg-1, diikuti pula oleh serapan tajuk dan total berturut-turut sebesar 17452,81 mg kg-1 dan 19577,05 mg kg-1 pada perlakuan yang sama. Efesiensi serapan hara K tertinggi sebesar 5,93% perlakuan 20 ton ha-1 (D4) dan dosis optimum sebesar 21,65 ton ha-1 dengan hasil tanaman jagung sebesar 4,54 ton ha-1.

Kata kunci : efesiensi serapan K, pupuk organik, brangkasan kacang tanah,  tanaman jagung