Growth and yield performance of lowland rice (Oryza sativa L.) PSB Rc18 as influenced by different levels of nitrogen and potassium fertilizers
2018
Amac, D.A.P. | Cagasan, U.A.
This study aimed to 1) evaluate the growth and yield performance of lowland rice PSBRc 18 as influenced by different levels of nitrogen and potassium fertilizers; 2) determine the potential level of nitrogen and potassium fertilizers that would give optimum yield; 3) determine the interaction effects of N and K levels on the growth and yield of lowland rice; and 4) assess the profitability of using different levels of nitrogen and potassium fertilizers in lowland rice production. An experimental area of 332.5 sqm was laid out in split plot arranged in RCBD with three replications. The nitrogen levels were designated as the mainplot: N sub 1 = 60 kg/ha N and N sub 2 = 120 kg/ha N. The Potassium levels as the subplot: K sub 0 = no fertilizer application (control), K sub 1 = 30 kg/ha K sub 2 O, K sub 2 = 60 kg/ha K sub 2O and K sub 3= 90 kg/ha. Application of 60 kg/ha N and 0-30 kg/ha K resulted in early heading of PSB Rc18. Likewise, application of 90 kg/ha K produced bigger leaf area index (LAI) than the control. PSB Rc18 applied with 60 kg/ha N without K fertilizer resulted in highest harvest index and produced a higher number and percent filled grains/panicle resulting in higher grain yield (t/ha). Application of 60 kg/ha N gave the highest net income of PhP 26,246.43/ha and rice plants not applied with potassium fertilizer resulted in highest net income of PhP 24,184.34/ha.
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