Asam humat merupakan senyawa akhir hasil dekomposisi dan humifikasi sehingga lebih bersifat resisten. Peranan asam humat antara lain : bahan penguat untuk meningkatkan efisiensi remediasi elektrokinetik dari kontaminasi arsenik , membatasi toksisitas Cd dan Pb pada cacing tanah di dalam tanah, agen penyemen dalam matriks tanah untuk menekan degradasi lingkungan tambang mineral. Penelitian dilakukan guna mendapatkan ektrak asam humat dari kompos limbah pertanian dan peternakan. Asam humat diekstrak dari kompos dengan menggunakan asam kuat dan basa kuat. Kompos dari Kotoran ayam diharapkan menjadi solusi limbah peternakan yang berpotensi mencemari lingkungan. Pembuatan kompos kotoran ayam dipadukan dengan limbah dan gulma pertanian seperti jerami, bonggol jagung, bonggol pisang, kulit durian dan eceng gondok. Dekomposisi dilakukan dengan bantuan biodekomposer EM4, Ragi Kompos dan Cacing tanah. Gugus fungsional yang menjadi penciri asam humat dari kompos kotoran ayam dengan beragam bahan tambahan dan biodekomposer yakni Puncak serapan 3450 - 3300 cm-1 , 2980-2920 cm-1, 1660-1630 cm-1 dan 1170-950 cm-1 . derajat humifikasi yang rendah di semua perlakuan merupakan penciri kompos dengan dengan tong berjalan efektif. EM4 paling efektif untuk meningkatakan laju dekomposisi bahan organikpada perlakuan
One of the problems encountered by coastal sandy land is the high concentration of salt which can cause limited water uptake, and ion poisoning to the plants. Silica is potential nutrient to solve salinity problem in coastal sandy land. The objectives of this experiment are to examine the effect of salinity conditions on the growth and yield of shallots in an Entisol. The study was conducted from August to November 2020 in the screen house of the Faculty of Agriculture and the Laboratory of Agronomy and Horticulture, Faculty of Agriculture, Jenderal Soedirman University. The experimental design used was a factorial randomized block design (RBD) 4 × 3 with three replications. Fertilizer Si consisted of 4 levels i.e. control or 0 g Si/pot; 10 g Si/pot, 20 g Si/pot, and 30 g Si/pot. The salinity (K) comprised 3 levels of dose: control; 2 dS/m/pot, and 4 dS/m/pot. There were 12 treatment combinations with 3 replications (36 experimental units). Each experimental unit was planted with 2 plants. The observed variables were plant height, number of leaves, fresh root weight, dry root weight, number of tillers, root volume, number of bulb, bulb diameter, fresh bulb weight, dry bulb weight. The results showed that the application of natural silica increases the number of leaves, the number of tillers and the number of bulb with an optimal dose of 11 g per plant. The increased level of salt reduced the weight of fresh roots, the number of tillers, the weight of fresh bulb, the weight of dry bulb, the number of bulb, and the diameter of the bulb. The effect of combination of Si fertilizer and salinity condition was found on the number of leaves, dry root weight, root volume and number of tillers.
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