Pengaruh Penambahan Kompos Kotoran Sapi dan FABA Terhadap Karakteristik Kimia pada Tanah Berpasir dan Pertumbuhan Tanaman Tomat: The Effect of Cow Manure Compost and Fly Ash-Bottom Ash (FABA) Addition on the Chemical Properties of Sandy Soil and Tomato Growth

Sandy soil has a low: ability of water retention, aggregate stability, and nutrient content. To improve its quality a mixture of compost and fly ash-bottom ash (FABA) need to be added to this soil. This study was aimed to determine the effect of compost and FABA as an ameliorant on the chemical properties of sandy soil and plant growth of tomato (Solanum lycopersicum). The pot experiment was carried out at Cikabayan Greenhouse, IPB University using a Completely Randomized Design with seven treatments and two replications. Each 5 kg of sandy soil per pot were mixed with cow manure compost and FABA at various doses. The test plant was tomato variety SL 975. Parameters of soil chemical properties were observed for organic-C, total N, available P, CEC, and exchangeable bases. Plant growth was observed at five weeks after planting (WAP). The A6 treatment, i.e. addition of 1,950 gram compost pot-1 and 25 gram FABA pot-1, showed the highest organic-C content in the soil (3.83%) as well as the plant height, leaf number, and fresh weight by 54.4 cm, 21 sheet, and 68.7 gram.Tanah berpasir memiliki kemampuan retensi air, kemantapan agregat, dan kadar unsur hara yang tergolong rendah. Untuk meningkatkan kualitas tanah berpasir ini dilakukan upaya pemberian berbagai dosis campuran kompos dan fly ash-bottom ash (FABA) sebagai amelioran. Tujuan penelitian ini yaitu menguji pengaruh pemberian kompos dan FABA sebagai bahan amelioran pada tanah berpasir terhadap karakteristik kimia tanah dan pertumbuhan tanaman tomat (Solanum lycopersicum). Percobaan pot dilakukan di Rumah Kaca Cikabayan, IPB University menggunakan Rancangan Acak Lengkap (RAL) dengan tujuh perlakuan dengan dua kali ulangan. Masing-masing 5 kg tanah berpasir per pot dicampur dengan kompos dan FABA pada berbagai dosis. Tanaman yang digunakan ialah tomat varitas SL 975. Parameter karakteristik kimia tanah yang diamati meliputi C-organik, N-total, P-tersedia, KTK, dan basa-basa dapat ditukar. Parameter pertumbuhan tanaman diamati pada lima minggu setelah tanam (MST). Hasil percobaan menunjukkan bahwa perlakuan A6, yaitu penambahan 1,950 gram kompos pot-1 dan 25 gram FABA pot-1, menghasilkan kadar C-organik tanah yang tinggi sebesar 3.83%, serta tinggi, jumlah daun, dan bobot basah tanaman tertinggi dengan nilai secara berturut-turut yaitu 54.4 cm, 21 lembar, dan 68.7 gram