Serapan Nitrogen Tanaman Padi Gogo (Oryza Sativa L.) Akibat Pemberian Kompos Campuran Kualitas Tinggi dan Rendah Berbagai Dosis

ROHMAD MAULIDANI, Anis Sholihah, Anita Qur'ania

Abstract


Upland rice (Oryza sativa L.) has the potential to be developed on dry land to support increased food production, but its productivity is still constrained by low soil fertility and nutrient availability, especially nitrogen (N). The use of mixed compost of high and low quality residues, namely soybean stover and rice straw, can be an alternative to increase plant N availability and uptake. This study aims to determine the growth response and N uptake of upland rice plants to the application of mixed compost of high and low quality residues at various doses and to determine the optimum dose. The study was conducted from July–December 2025 at the Greenhouse of the Integrated Laboratory of the Islamic University of Malang, Malang Regency, using a simple Randomized Block Design (RBD) with five compost dose treatments, namely 0, 5, 10, 15, and 20 tons.ha⁻¹, each replicated three times with five sample plants to obtain 75 experimental units. Data were analyzed using analysis of variance at a 5% level, 5% LSD test, regression, and correlation. The results showed that the application of mixed compost significantly affected the growth and N uptake of upland rice plants. The treatment of 15 tons.ha⁻¹ provided the most consistent growth response in the 8th week, with a plant length of 103.78 cm, leaf area 2,310.72 cm², and number of tillers 48.67. The theoretical optimum dose based on regression analysis was obtained at 17.31 tons.ha⁻¹ with the equation Y = -0.720x² + 24.958x + 137.66 and R² = 0.8021. N uptake was strongly positively correlated with plant length (r = 0.98), leaf area (r = 0.96), N use efficiency (r = 0.90), number of leaves (r = 0.81), and number of tillers (r = 0.79). Thus, a mixture of high- and low-quality residue compost has the potential to increase growth, N uptake, and N use efficiency of upland rice plants on dryland land, with a theoretical optimum dose of 17.31 tons.ha⁻¹.

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References


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