<p><em>Penelitian ini bertujuan untuk mengetahui pengaruh pemberian trichokompos dan biochar dan mendapatkan dosis trichokompos dan biochar yang terbaik bagi pertumbuhan dan hasil tanaman jagung pada tanah Ultisol. Penelitian dirancang dengan metode eksperimen lapangan pola Rancangan Percobaan Petak Terpisah (Split Plot) yang terdiri dari 2 faktor perlakuan, yaitu faktor pemberian biochar sebagai petak utama terdiri dari 3 taraf perlakuan, yaitu B0 = tanpa biochar, B1 = 10 ton/ha dan B2 = 15 ton/ha. Faktor pemberian trichokompos jerami padi sebagai anak petak terdiri dari 4 taraf yaitu K0 = tanpa trichokompos, K1 = 10 ton/ha, K2 = 15 ton/ha, K3 = 20 ton/ha. Parameter pertumbuhan yang diamati meliputi tinggi tanaman, berat kering dan volume akar pada fase vegetatif maksimum. Sifat kimia tanah yang diamati meliputi C organik, N, P dan K tanah pada akhir penelitian. Data hasil pengamatan dianalisis uji F pada taraf 5% kemudian dilakukan Uji lanjut menggunakan uji Beda Nyata Jujur (BNJ). Hasil penelitian menunjukkan adanya pengaruh nyata dari faktor tunggal pemberian biochar sekam padi dan trichokompos jerami padi dan terjadi interaksi perlakuan terhadap pertumbuhan jagung dan sifat kimia tanah Ultisol. Dosis biochar yang dapat meningkatkan pertumbuhan pada tanaman jagung di tanah Ultisol adalah 10-15 ton/ha. Dosis terbaik pemberian trichokompos terhadap pertumbuhan tanaman jagung di tanah Ultisol adalah 15-20 ton/ha. Terdapat interaksi pemberian biochar sekam padi dan trichokompos pada tanaman jagung di tanah Ultisol. Dosis terbaik yang direkomendasikan pada pemberian kombinasi perlakuan biochar dan trichokompos yaitu B1K3 (biochar 10 ton/ha dan trichokompos 20 ton/ha).</em></p><p><strong><em>Kata Kunci</em></strong><em>: </em><em></em></p><p><em>Tanaman Jagung; Biochar; Trichokompos; Tanah Ultisol</em></p><p><em><br /></em></p><p><strong>Utilization of Trichocompost and Biochar from Rice Waste to Increase Corn Growth and Chemical Properties of Ultisol Soil</strong></p><p><strong><em>ABSTRACT</em></strong><strong><em></em></strong></p><p><em><em>This study aims to determine the effect of giving trichocompost and biochar and to obtain the best dose of trichocompost and biochar for the growth and yield of corn on Ultisol soil. The study was designed using the field experiment method with a Split Plot Experimental Design pattern which consisted of 2 treatment factors, namely the factor of giving biochar as the main plot consisting of 3 treatment levels, namely B0 = no biochar, B1 = 10 tons/ha and B2 = 15 tons/ha. Factors giving rice straw trichocompost as subplots consisted of 4 levels, namely K0 = no trichocompost, K1 = 10 tons/ha, K2 = 15 tons/ha, K3 = 20 tons/ha. Growth parameters observed included plant height, dry weight, and root volume in the maximum vegetative phase. The chemical properties of the soil observed included organic C, N, P, and K soil at the end of the study. Observational data were analyzed by F test at 5% level then further test was carried out using the Honest Significant Difference (HSD) test. The results showed that there was a significant effect of the single factor giving rice husk biochar and rice straw trichocompost and there was an interaction treatment on corn growth and the chemical properties of Ultisol soil. The dose of biochar that can increase the growth of corn on Ultisol soil was 10-15 tons/ha. The best dose of trichocompost on the growth of corn on Ultisol soil was 15-20 tons/ha. There was an interaction between giving rice husk biochar and trichocompost to corn plants on Ultisol soil. The best recommended dose for the combination of biochar and trichocompost treatment was B1K3 (10 tons/ha biochar and 20 tons/ha trichocompost).</em><br /></em></p>

This study aims to determine the effect of various doses of rice husk biochar combined with organic amendments of cow manure and inorganic amendments of recommended fertilizer packages (urea, TSP, and KCl) on acid-sulfate soils. Over four months, the study was conducted in the Experimental Land of the Center for the Assessment of Agricultural Technology (BPTP) Pal IX, West Kalimantan Province. The study employed a randomized block design, with treatments including control soil, rice husk biochar 6 t ha-1, rice husk biochar 8 t ha-1, rice husk biochar 10 t ha-1, rice husk biochar 12 t ha-1, package of recommended inorganic fertilizer, package of recommended inorganic fertilizer + rice husk biochar 10 t ha-1, manure 10 t ha-1, and 10 t ha-1 + rice husk biochar 10 t ha-1. The findings revealed that single rice husk biochar amendments and their combination with inorganic and organic amendments had varying effects on the improvement of several physical properties of acid sulfate soils (density, total pore, moisture content, and penetration resistance). The amendment of a single biochar with a dose of 12 t ha-1 resulted in the lowest bulk density of acid sulfate soil, which decreased by 16% compared to the control soil. At a dose of 12 t ha-1, rice husk biochar produced the highest porosity and soil moisture content, 55% and 17%, respectively. The soil strength, as measured by the lowest penetration resistance, decreased by 30% in the treatment of manure 10 t ha-1 + biochar 10 t ha-1 (350 N cm-2) compared to the control soil.   Keywords: biochar rice husk, soil amendment, soil properties of acid sulphate

<em>The Purpose to increase soil fertility can be carried out through the provision of liquid organic fertilizers by utilizing agricultural waste including pineapple waste. The research aims to determine the potential and chemical characteristics of pineapple peel waste and to determine the effect of liquid organic fertilizer dosage on increasing soil fertility of Ultisols. The research was conducted at the Faculty of Agriculture, Panca Bhakti University, Jl. Komyos Sudarso Pontianak had been held from June 2022-August 2022. The research used a completely randomized design (CRD), with dosage treatment of liquid organic fertilizer from pineapple plant waste P0 = 0 ml/l water, P1 = 15 ml/l water, P2 = 20 ml/l water, P3 = 25 ml/l water, P4 = 30 ml/l water, P5 = 35 ml/l water, P6 = 40 ml/l water, P7 = 45 ml/l water, P8 = 50 ml/l water. Data were analyzed using ANOVA, which showed a significant difference followed by an Honest Significant Difference (HSD) Test at the 5% level. Treatment of the dose of liquid organic fertilizer from pineapple waste can increase the fertility of ultisol, especially in soil pH, % C organic, % N of total soil, C/N ratio, and P and K content in Ultisol soil. Treatment of the dosage of liquid organic fertilizer for pineapple plant waste of 50 ml/l was the treatment that gave the best results on the parameters of soil pH, % C organic, % N of total soil, C/N ratio, the content of P and K elements in the soil.</em>

Acid sulfate soils have potential for agricultural development. However, this soil has various properties problems that can inhibit plant growth. One way to improve soil properties is through the application of biochar amendments. The study aimed at knowing the role of rice husk biochar combined with amendments to Chromolaena odorata, rice straw, and rice husk ash to improve the properties of acid sulphate soil. The study was conducted in a greenhouse and arranged in a complete randomized design (CRD) with three replications. Biochar amendments consisted of nine kinds, namely, without amendments (control), C. odorata (10 t/ha), rice straw (10 t/ha), rice husk biochar (10 t/ha), rice husk ash (10 t/ha), C. odorata (10 t/ha)+rice husk biochar (5 t/ha), rice straw (10 t/ha)+rice husk biochar (5 t/ha), C. odorata (10 t/ha)+rice husk ash (5 t/ha), and rice straw (10 t/ha)+rice husk ash (5 t/ha). The results showed that the amendment of rice husk biochar combined with amendments to C. odorata and rice straw, respectively, had a good effect on improving soil physical properties, namely, total soil pores, reducing soil content weight and soil strength. Its effect on soil chemical properties was that it could increase pH, C-organic, P-available, cation exchange capacity (CEC), lower Al-dd and Fe soluble. The research findings showed that applying biochar and organic amendments to Chromolaena odorata and rice straw could potentially improve the properties of acid sulphate soil. In future research, we recommend increasing the carrying capacity of acid sulphate soil against plant growth, and it can be done by improving soil properties through the organic amendments’ application of C. odorata or straw enriched with rice husk biochar.