Pengaruh Formula Pembenah Tanah Organik Granul Terhadap Sifat Kimia Tanah Dan Pertumbuhan Tanaman Pada Lahan Kering Masam

Acid upland needs to be managed intensively to overcome the inherent constraints of the physical and chemical properties of the soil. Research on the effect of granular organic soil amendment formula to the soil chemical properties and plant growth on acid upland was carried out in the greenhouse.The study aimed to evaluate the effectiveness of granular organic soil amendment formulas that have been enriched with humic compounds as a substitute for lime to improve soil chemical properties and plant growth. The study was conducted with a pot experiment using a randomized block design with 10 treatments and 3 replications. The treatments are consist of 3 types of soil amendment, namely lime, chicken manure compost (CMC) and cow dung compost (CDC), each with 3 dosage levels. Mungbean plants are used as indicators planted in pots with 3 plants each. The results revealed that lime as soil amendment quickly increased soil pH and decreased exchangable Aluminium (Exch-Al). Meanwhile the formula CMC is superior in increasing soil organic carbon. The CMC also increase soil pH and reduce the exch-Al levels, but the intensity is lower than lime. The CDC soil amendment has less effect on increasing pH and neutralizing exch-Al. The CMC soil amendment can increase the growth and production of mungbean. Mungbean dry biomass increased about 60% and grain production increased about 56% compared to control treatment. The growth and production of mungbean from CMC treatment is better than lime treatment. It can be concluded that chicken manure compost and cow dung compost can be used to substitute of lime as soil amendment on acid upland. Keyword: acid upland, lime, manure, productivity, soil amendmen

PENGARUH FORMULA PEMBENAH TANAH ORGANIK GRANUL TERHADAP SIFAT KIMIA TANAH DAN PERTUMBUHAN TANAMAN PADA LAHAN KERING MASAM

Lahan kering masam perlu dikelola secara intensif untuk mengatasi kendala inheren sifat fisik dan kimia tanahnya. Penelitian pengaruh formula pembenah tanah organik granul terhadap sifat kimia tanah dan pertumbuhan tanaman pada tanah kering masam telah dilakukan di rumah kaca Balai Penelitian Tanah. Penelitian bertujuan untuk mengevaluasi efektivitas formula pembenah tanah organik granul yang telah diperkaya senyawa humat sebagai pengganti kapur untuk memperbaiki sifat kimia tanah dan pertumbuhan tanaman. Penelitian dilakukan dengan percobaan pot menggunakan rancangan acak kelompok dengan 10 perlakuan dan 3 ulangan. Perlakuannya adalah 3 jenis pembenah tanah yaitu kapur, formula pukan ayam plus dan formula pukan sapi plus, masing-masing dengan 3 level dosis. Tanaman kacang hijau digunakan sebagai indikator yang ditanam dalam pot masing-masing dengan 3 tanaman. Hasil penelitian menunjukkan bahwa pembenah tanah kapur pertanian dengan cepat meningkatkan pH tanah dan menurunkan Al- dd. Sedangkan formula pembenah tanah pukan ayam plus lebih unggul dalam peningkatan karbon organik tanah. Pembanah organik pukan ayam plus juga dapat meningkatkan pH tanah dan menurunkan kadar Al-dd, namun intensitasnya lebih rendah dari kapur. Formula pembenah tanah pukan sapi plus, kurang berpengaruh terhadap peningkatan pH dan menetralisir Al-dd. Pembenah tanah pukan ayam plus dapat meningkatkan pertumbuhan dan produksi tanaman kacang hijau. Produksi biomas kacang hijau meningkat 60% dan produksi biji meningkat 56% dibandingkan dengan perlakuan kontrol. Pertumbuhan dan produksi kacang hijau dari perlakuan pukan ayam plus lebih baik dibandingkan dengan perlakuan kapur. Dapat disimpulkan bahwa pembenah tanah pukan ayam plus dan pukan sapi plus dapat dipakai sebagai pembenah tanah pengganti kapur pada lahan kering masam

Perbandingan Pengaruh Beberapa Jenis Pupuk Mengandung Fosfat terhadap Kehilangan Hara Melalui Pelindian pada Tanah Gambut

Subiksa et al, 2018. Comparison Effect of Several Phosphate Contain Fertilizers to Nutrient Loss Trough Leaching on Peat Soil . JLSO 7(1):1-13. Peat soil have specific nutrient adsorption characteristics which are affected by soil pH dependent charge. Therefore, nutrient management on such soil should be done using different approach compared to mineral soil. Research on the comparison effects of several types of phosphate containing fertilizers to nutrient loss through leaching on peat soil has been carried out in greenhouse using coulom experiments. The objectives of this study was to evaluate the rate of primary macro nutrient loss and look for fertilization technology which can reduced leaching rate. The study used a randomized block design of 14 treatments with 3 replications. The treatments were complete control treatment, partial control and 4 types of P contain fertilizer, namely SP-36, NPK compound, Chrismast Island Phosphate Rock (CIRP), and Pugam each of them with 3 levels dose. The peat soil used was ombrogenous peat with hemic maturity level taken from OKI Regency, South Sumatra. Watering is done every 2 days with 350 ml ion-free water/pot. The results showed that N and K nutrients leaching, mostly due to aplication rate of those nutrient, whereas type of fertilizer was not revealed significantly different. Meanwhile, P concentration in leachate water was significantly different among treatments. Leaching of P in the control treatment was very low because of P content of peat soil was low. The highest loss of P trough leaching rate is shown by the NPK treatment because NPK compound is belong to fast nutrient release fertilizer. CIRP and Pugam treatments showed low P loss trough leaching rates due to the slow release of P on CIRP and Pugam. The low leaching rates of CIRP and Pugam are also because of high content of Al and Fe as polyvalent cation that can promote new soil positive charges as site adsorption of P. It can be concluded that fertilization with a slow release type of phosphate fertilizer and contain sesquioxide as source of polyvalent cations such as CIRP and Pugam can reduced the rate of phosphate loss trough leaching