Kurangnya informasi tentang kesuburan tanah suatu DAS menyebabkan penentuan penggunaan lahan yang tidak sesuai dengan tingkat kemampuan dan kesesuaian lahan. Penelitian ini bertujuan: (1) menentukan nilai dan kelas indeks kesuburan tanah di sub DAS Dinoyo Jember;(2) menentukan satuan peta lahan dengan kesuburan tanah tertinggi; (3) mengetahui urutan faktor penentu indeks kesuburan tanah dari yang berpengaruh hingga kurang berpengaruh. Penelitian ini dilakukan pada bulan Oktober 2019 -Februari 2020. Penelitian berupa survey tanah dengan metode purposive sampling pada 18 satuan peta lahan (SPL), setiap SPL diambil tiga sampel tanah yang telah dikomposit. Pengambilan sampel tanah dilakukan pada kedalaman 0-30 cm. Parameter yang diamati antara lain; KTK, C-Organik, N total, P tersedia, K dapat ditukar , Mg dapat ditukar, Ca dapat ditukar, dan Al dapat ditukar. Hasil analisis tanah digunakan untuk penilaian indeks kesuburan tanah. Hasil penelitian menunjukkan bahwa nilai indeks kesuburan tanah di sub DAS Dinoyo berkisar antara 130-170 yang dikategorikan dalam kelas agak rendah hingga sedang. Nilai indeks kesuburan tanah tertinggi (170) dengan kategori kelas sedang terdapat pada penggunaan lahan kebun dengan jenis tanah Latosol coklat kemerahan (Inceptisols) serta kemiringan lereng 25-40% (SPL 9) dan pada penggunaan lahan sawah dengan jenis tanah asosiasi Latosol coklat regosol kelabu (Inceptisols) serta kemiringan lereng 15-25% (SPL 14). Urutan faktor penentu indeks kesuburan tanah dari yang paling berpengaruh hingga kurang berpengaruh berturut-turut adalah kemiringan lereng, jenis tanah, dan penggunaan lahan.
Sandy land has a considerable potential to resolve the problem of the narrowing area of agricultural land in Indonesia. Improvement of sandy land quality which belongs to the marginal land is necessary in order to increase its productivity, for example through the addition of compost and organic liquid fertilizer. This research aims to know the effect of blotong compost and organic liquid fertilizer of Eichhornia crassipes to endomycorrhizal infection and the production of sorghum plants. The experimental design used was factorial completely randomized block design with 2 factors and 3 replicates. The first factor was dose of blotong compost which consists of 3 levels, i.e. 0, 20, and 40 tons blotong compost /ha. The second factor was concentration of the organic liquid fertilizer of Eichhornia crassipes consists of 4 levels, i.e. 0, 10, 25, and 40% of the organic liquid fertilizer of Eichhornia crassipes. Further data obtained were analyzed using ANOVA, followed by Duncan Multiple Range Test (DMRT) for significantly different data. The results showed that the application of blotong compost increase soil Corganic, total soil microorganisms, plant height and lowering endomycorrhizal infection. Optimal fertilizing compost blotong dose is 40 tons/ha. The application of organic liquid fertilizer of Eichhornia crassipes increase the total soil microorganisms with optimal concentration of 40%, as well as reducing endomycorrhizal infection. The combination treatment of 20 tons of compost blotong/ha and 10% organic liquid fertilizer of Eichhornia crassipes already enhance the growth and production of sorghum, but the maximum growth and plant production is achieved with the addition of 40 tons of compost blotong/ha and 40% organic liquid fertilizer of Eichhornia crassipes. Keywords: Root infection, sandy land, blotong, Eichhornia crassipes, sorghum ABSTRAK Lahan pasir pantai memiliki potensi cukup besar untuk mengatasi masalah semakin menyempitnya luasan lahan pertanian di Indonesia. Perbaikan kualitas lahan pasir pantai yang termasuk ke dalam lahan marginal sangat diperlukan agar dapat meningkatkan produktivitasnya, misalnya melalui penambahan pupuk kompos dan pupuk organik cair (POC). Penelitian ini bertujuan untuk mengetahui pengaruh pemupukan kompos blotong dan POC eceng gondok terhadap infeksi endomikoriza dan produksi tanaman sorgum. Penelitian ini menggunakan rancangan acak kelompok (RAK) dengan 2 faktor dan 3 ulangan. Faktor pertama yaitu dosis kompos blotong yang terdiri atas 3 taraf yaitu 0, 20, dan 40 ton kompos blotong/ha. Faktor kedua yaitu konsentrasi POC eceng gondok yang terdiri atas 4 taraf yaitu 0, 10, 25, dan 40% POC eceng gondok. Data dianalisis menggunakan ANOVA. Apabila antar perlakuan berbeda nyata maka dilakukan uji lanjut menggunakan Duncan Multiple Range Test (DMRT). Hasil penelitian menunjukkan bahwa pemberian blotong dapat meningkatkan C-organik tanah, total mikroorganisme tanah, tinggi tanaman, serta menurunkan infeksi endomikoriza. Dosis pemupukan kompos blotong yang optimal adalah 40 ton/ha. Pemberian pupuk organik cair eceng gondok dapat meningkatkan total mikroorganisme tanah dibanding kontrol dengan konsentrasi optimal 40%, serta menurunkan infeksi endomikoriza. Kombinasi perlakuan 20 ton kompos blotong/ha dan 10% POC eceng gondok sudah dapat meningkatkan pertumbuhan dan produksi tanaman sorgum, namun pertumbuhan dan produksi tanaman maksimum dicapai pada perlakuan penambahan 40 ton kompos blotong/ha dan 40% POC eceng gondok. Kata kunci: Infeksi endomikoriza, tanah pasir pantai, blotong, eceng gondok, sorgum.
Most of the activities of the use of organic fertilizers and natural additions of organic matter in agricultural intensification fields in Indonesia have not been able to compensate for the rate of decline in soil organic matter by the decomposition process. Biochar has a high C level and has the mean residence time in a long period in the soils. It has been proven that biochar applications may increase soil Carbon but have not been able to increase plant production. Therefore, the use of biochar combined with organic waste rich in nutrients is essential to develop. The purpose of this study was to determine the effectiveness of some biochar compositions with sugar cane, chicken manure, fish waste in the form of biopellet fertilizer on improving the chemical properties of sandy soils and the vegetative growth of soybean plants. This study used a completely randomized block design with two factors. The first factor (B) was the composition of biochar consisting of three levels, namely: 70% biochar, 15% chicken manure, 15% fish waste (B1), 50 % biochar, 25% chicken manure, 25% fish waste (B2), and 20% biochar, 40% chicken manure, 40% fish waste (B3). The second factor (D) was the dose of biopellet fertilizers consisting of four levels, namely: control (D0), 2.5 t/ha (D1), 5 t/ha (D2), and 10 t/ha (D3). The results showed that the addition of biopellet fertilizer effectively improved soil chemical properties (pH, C-organic, and CEC) and the availability of N, P, and K of the sandy soil. The effectiveness of increasing the soil total-N varied from 32.42 to 75.79%, P-available varied from 17.46 to 40.69%, and exchangeable K ranged from 8.7 to 25.67%. Improvement of soil chemical properties and the availability of N, P, and K by biopellet fertilizer application increased plant growth but reduced the weight of root nodules.
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