The application of liquid organic fertilizer (LOF) enriched with micronutrients to plants growing on acidic soils was very effective in meeting nutritional needs. The purpose of this study was to obtain a dose of LOF that can increase yields on acidic soils. The study was conducted in Malang, from October 2018 - February 2019, the study used a randomized block design with 9 treatments. LOF has a very noticeable influence on the growth and yield of rice plants because it was suspected that the nutrients applied through the leaves more effective. The addition of LOF 18 ml. l−1 at a dose of 100% urea, dry grain reached 7.6 t.ha−1, it yield was higher than the treatment of 100% urea without LOF which was 6.75 t/ha. RAE calculations show that the D treatment produced a RAE value that reached 143%, while the second highest RAE value was the H treatment which has a RAE value = 122%. The analysis of farming business in treatment D reached a total profit of Rp. 21.847.000 and the second largest profit was in treatment H with a profit of Rp. 20.313.400. Adding LOF of as much as 18 ml.l−1 have substituted urea till 50%.

The bulb is an important traditional medicine used by Dayak tribes against heart disease, as an anti-inflammatory (Kuntorini, Astuti, & Nugroho, 2010), to increase breast-milk production as well as for treatment of diabetes, breast cancer, stroke, hypertension, sexual disorders (Insanu, Kusmardiyani,

Degraded land caused by gold mining activities in Central Kalimantan requires reclamation efforts, in order to restore of soil conditions, due to the damage of topsoil layer, lack of soil nutrients, and reduced of soil fertility. This research aim was to find an appropriate method of biological reclamation in ex gold mining area, by utilizing a combination of several types of microorganisms and mercury phytoremediator plants. The research is an experiment on a pilot scale at an ex gold mining site in Central Kalimantan. Bioremediation method has used a consortium of local isolates Klebsiella sp. and Pseudomonas sp., and the phytoremediation method was used Melastoma sp. and Cyperus sp. Dependent variables were soil mercury concentration and soil nutrients. The results showed the application of consortium microorganisms and mercury phytoremediator, were able to reduce soil mercury concentrations in averages 2.5 ppm, soil nutrient levels increased in averages 33%. These increased soil nutrients consist of potassium in averaged 73%, Mg in average 21%, Na in average 19.5%, and Fe in averaged 71%, when compared to controls. The application of consortium of microorganisms combined with mercury plant phytoremediator type Melastoma sp., able more to improve soil conditions in ex gold mining area compared to Cyperus sp.

Pertanian organik merupakan teknik budidaya pertanian yang berorientasi pada pemanfaatan bahan-bahan alami (lokal) denganmenekankanpada kestabilanlingkungan sedangkan pertanian konvensional merupakan kebiasaan yang dilakukan petani setempat.Indikatorkestabilan pertanianorganik maupun konvensional dapatdiketahuidaridiversitas dankelimpahan arthropoda nokturnal.Penelitian bertujuan untuk mengetahui struktur komunitas arthropoda nokturnal pada jagung manis dan kacang panjang organik dan konvensional di lahan gambut. Penelitian dilaksanakan pada lahan seluas 210 m2, yang dibagi menjadi 12 petak percobaan (luas per petak 12 m2). Lahan tersebut ditanami sayuran jagung manis dan kacang panjang dengan perlakuan organik dan konvensional. Penelitian menggunakan teknik perangkap cahaya (Light Trap)untuk menangkap arthropoda nokturnal. Pengolahan data ditabulasi dengan Microsoft Excel. Pada petak organik dijumpai 8 Ordo dan 25 famili, sedangkan pada petak konvensional dijumpai 7 ordo dan 28 famili. Komposisi peran ekologis arthropodanokturnal yang ditemukanpada petak organik maupun konvensional terdiri dari predator (62,50%), hama (18,54%),serangga berguna lainnya (10,00%) dan parasitoid (8,96%). Diversitas arthropoda nokturnal yang diperoleh pada petak organik kacang panjang berdasarkan indeks diversitas Shannon-Wiener menunjukkan nila tertinggi (H'=2,12), sedangkan petak lainnya menunjukkan nilai H > 1.