Home⇛Annals of Tropical Research⇛vol. 44 no. 2 (2022)

Growth and yield response of lowland rice (Oryza sativa L.) to planting density and nutrient management

Geleca C. Igdanes-Marañan | Berta C. Ratilla

 

Abstract:

Planting density and nutrient management practices may affect lowland rice production. This study was conducted to evaluate their effects on growth and yield of lowland rice (NSIC Rc400), determine the appropriate number of seedlings hill and nutrient management for optimum yield, and assess their -1 profitability on rice. A split-plot arranged in Randomized Complete Block Design was used with three replications. Planting densities (M =1 seedling hill and 1 -1 M =3-5 seedlings hill ) were designated as mainplots while nutrient management 2 -1 practices as subplots;T =0-0-0 (Control), T =120–60–60kg ha N, P O , and K O, 1 2 2 5 2 -1 T =60–30–30kg ha N, P O , and K O + 2.5t ha vermicast + biweekly foliar urea 3 2 5 2 -1 -1 spray, T =45–30–30kg ha N, P O , and K O + 2.5t ha vermicast + weekly foliar 4 2 5 2 -1 -1 urea spray, and T =30–30–30kg ha N, P O ,and K O + 2.5t ha vermicast + weekly 5 2 5 2 -1 -1 foliar urea spray. Results revealed that produced more filled M spikelets panicle 1 -1 regardless of nutrient management. Early heading and maturity were noted at T , 1 T and T treatments. Integrated nutrient application at T significantly increased 4, 5 3 growth, and yield parameters of lowland rice with higher gross income and benefit-cost ratio, next to the recommended dose of inorganic fertilizer (T ). This 2 was due to the high labor and material cost incurred with the integrated nutrient application net income were obtained with M and 1 . Highest and benefit-cost ratio T . Transplanting 1 seedling hill with combined inorganic and vermicast 2 -1 application (T ) seemed appropriate for NSIC Rc400 especially if the farmer has 3 his own vermicast production.



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