Abstract:
The addition of N, P, K, Nano-silica, and Straw Compost proves to be beneficial in providing
both macro and micronutrients for paddy rice plants. In lowland rice cultivation, nutrient
deficiencies are often encountered, particularly in growing media or soils characterized by high
acidity, such as Ultisols. To enhance CEC, pH, P absorption, and yield of lowland rice on
Ultisols, this study investigates the fertilization of N, P, K, Nano-silica, and Straw Compost.
Conducted at the Padjadjaran University Faculty of Agriculture's Chemistry and Plant Nutrition
Experimental Field in Jatinangor, Sumedang, West Java, situated at an elevation of 723 meters
above sea level, the field trial comprised ten treatments with three replications each. The
treatments included Control (Without N, P, K, Si, and Straw Compost); Straw Compost (5 tons
per hectare) + ½ N, P, K, Si; Straw Compost (5 tons per hectare) + 1 N, P, K, Si; Straw Compost
(5 tons per hectare) + 1½ N, P, K, Si; Straw Compost (10 tons per hectare) + ½ N, P, K, Si;
Straw Compost (10 tons per hectare) + 1 N, P, K, Si; Straw Compost (10 tons per hectare) + 1½
N, P, K, Si; Straw Compost (15 tons per hectare) + ½ N, P, K, Si; Straw Compost (15 tons per
hectare) + 1 N, P, K, Si; Straw Compost (15 tons per hectare) + 1½ N, P, K, Si. The results
indicate that the combination of fertilizer doses comprising 1 N, P, K, Nano-silica, and 10
tons/ha of Straw Compost yielded the highest rice yield, with a harvested dry grain weight of
11.00 g.plants-1.
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