Amelioran Organik dan Mikoriza Meningkatkan Status Fosfat Tanah dan Hasil Jagung pada Tanah Andisol

. A common problem of Andisol soils is the high capacity for P adsorption, although total P content is relatively high. This characteristic causes inefficient use of P fertiliser, to the point that P deficiency can become a major constraint for crop production. This study aimed to determine the effect of organic ameliorants and mycorrhiza on the status of soil phosphate and yield of maize in Andisol. The experiment was carried out in pots and arranged in a randomized complete block design (RCBD) 4x2 factorial with 3 replications. The first factor is the addition of organic ameliorant consisting of 4 treatments: without ameliorant, manure, rice straw and Gliciridea leaves. The dosage of each ameliorant is 20 ton ha-1 or equivalent to 111 g per polybag. The second factor is the application of mycorrhiza, consisting of 2 levels, no mycorrhiza and mycorrhiza at 10 g per polybag. The results showed that the application of organic ameliorant and mycorrhiza affected soil pH, total P (HCl 25% extractable P), available P (Bray 1), and the P availability index and increased the growth and yield of maize in Andisol. The two treatments that provided the most effect on the status of soil phosphate and plant growth and yield of maize were manure, and Glyricidea leaves, in combination with the addition of mycorrhiza

Pengaruh Konsentrasi Serta Waktu Aplikasi Campuran Ekstrak Daun Sembung dan Daun Tembakau sebagai Pengendali Hama Penggulung Daun pada Tanaman Kedelai (Glycine Max L. Merrill)

Penurunan produksi kedelai sebesar 24,37 persen dari tahun 2014 hingga 2015, selain terjadi karena penurunan luas panen seluas 9,99 ribu hektar (23,35 persen) dan produktivitas sebesar 0,20 kuintal/hektar (1,35 persen) (BPS, 2016), juga dipengaruhi oleh faktor lain diantaranya benih yang digunakan bermutu rendah, pemupukan tidak berimbang, dan pengendalian hama belum efektif. Untuk meningkatkan produksi kedelai dibutuhkan inovasi teknologi yang memperhatikan lingkungan, sehingga perlu mengkaji dengan alternatif lain, salah satunya memanfaatkan jenis tanaman yang dapat digunakan sebagai pestisida nabati yaitu ekstrak daun sembung dan ekstrak tembakau. Penelitian ini menggunakan Rancangan Acak Kelompok dengan dua faktor yaitu faktor konsentrasi, yaitu; 0 ml, 10 ml, 15 ml dan 20 ml. Faktor waktu pemberian, yaitu; 15 hst dan 30 hst Hasil penelitian menunjukkan bahwa konsentrasi campuran ekstrak daun sembung dan daun tembakau berpengaruh nyata terhadap intensitas serangan larva spodoptera litura pada umur tanaman 37 hari, 52 hari dan sangat nyata pada umur tanaman 67 hari dengan konsentrasi ekstrak 20 ml mampu mengendalikan dan menghambat perkembangan larva spodoptera litura serta dengan waktu pemberian berpengaruh sangat nyata terhadap intensitas serangan pada umur tanaman 37 hari, 52 hari dan 67 hari tanam dan tidak terjadi interaksi dari konsentrasi dan waktu pemberian terhadap intensitas serangan larva spodoptera litura

Efektifitas Pestisida Nabati dan Biochar terhadap Serangan Ulat Daun ( Plutella Xylostella) pada Tanaman Selada

Until now, plant-based pesticides are rarely used by farmers because many do not know how to make them and think they are less effective in eradicating pests and diseases. This study aims to determine the level of effectiveness of vegetable pesticides and biochar against attacks on lettuce. This research was carried out at the Experimental Garden of the Faculty of Agriculture, Jabal Ghafur Sigli University, from August to September 2020. This study used a factorial patterncheck-group design (RAK), there were 2 factors studied, namely the concentration factor of soursop leaf extract (P) and biochar (B). There are 3 levels of soursop leaf extract concentration factor, namely P1 = 15%/l water, P2 = 30%/l water, P3 = 45%/l water and biochar consists of 3 levels, namely B1 = 10 tons ha-1, B2 = 20 tons ha-1 , B3 = 30 tons ha-1. Parameters observed were attack intensity, mortality percentage, plant weight. The results showed that soursop leaf extract had a very significant effect on all variables, the intensity of attack decreased with increasing concentration of soursop leaf extract, as well as mortality reached 72.22% at the lowest concentration tested. attack and mortalit

Perubahan Karakteristik Sifat Kimia Tanah pada Areal Pengembangan Penelitian Lahan Kering Gle Gapui

Dry land is one of the that has the characteristic of the chemical properties of the soil that is less fertile, so that it can reduce the potential for agricultural development. Low soil fertility is an abstacle in the development of dry land. This study aims to determine changes in the chemical characteristics of the Gle Gapui dry land research development area from 2016 to 2020. This research was carried out at the Experimental Gardening of the Faculty of Agriculture, Jabal Ghafur University. The method used in this study was descriptive-quantitative method by analyzing several parameters of soil chemical properties, namely soil pH, C-organic, N-total, available P, Ca-dd, Mg-dd, K-dd, Al-dd, Kb and DHL. The results of the study indicate that there has been a change in the characteristics of the chemical properties of the soil at SPL 4 in the Gle Gapui dry land research development area