Abstract:
Agricultural intensification and extensification need to be done to increase rice productivity.
Silicon (Si) is a non-essential nutrient that plays a positive role in growth and yield. The
application of liquid NPKSi fertilizer increases nutrient availability, particularly on Ultisols. The
purpose of this study was to assess the effectiveness of liquid NPKSi fertilizer and straight
fertilizer on nutrient uptake and yield of paddy rice on Ultisols. This research was conducted
from September 2023 to June 2024 at the Soil Fertility and Plant Nutrition Experimental Farm
and the Soil Chemistry and Plant Nutrition Laboratory. This study used a Randomized Block
Design (RBD), which consisted of nine treatments and three replications. The treatments
included control, recommended N, P, and K fertilizers, and various doses of liquid NPKSi
fertilizer and straight fertilizer. The results showed that liquid NPKSi fertilizer and straight
fertilizer were effective in increasing nutrient uptake and yield of paddy rice on Ultisols. The
highest fertilizer effectiveness was found in the treatment of 6 L.ha-1 liquid NPKSi fertilizer and
straight fertilizer (175 kg.ha-1 Urea, 37.5 kg.ha-1 SP-36, and 25 kg.ha-1KCl) with an RAE value
of 218%.
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