This study sought to assess the effect of paclobutrazol on the performance of lowland rice when grown in acidic and alkaline soils. Determine the soil type that can produce maximum productivity, and evaluate the profitability of growing lowland rice to the paclobutrazol application under acidic and alkaline soils. The experiment was set out in a split plot organized in RCBD with soil types (ideal, acidic, and alkaline) as the main plot while the time of paclobutrazol is the subplot. The time of paclobutrazol application is indicated as follows: S1control, S2at the vegetative stage, S3at the heading stage, and S4in both vegetative at heading stages. Statistical analysis revealed that regardless of the time of paclobutrazol application in lowland rice ideal soil showed a significant influence in most agronomic and yield and yield component parameters, and achieve the highest gross income (PHP 143,820.00) and gross margin of PHP 100,368.72. The application of paclobutrazol at heading (S3) shows a significant outcome on the number of nodal roots plant -1 (411.11) and obtained the highest gross income comparing other subplot treatments. A remarkable effect on leaf area index (2.27), fresh straw yield (8.37 t ha -1 ), and root length (41.53 cm) were obtained in S3 plants and had a higher grain yield of 3.77 t ha -1 . Paclobutrazol is advisable in lowland rice regardless of the time of application under ideal soil to effect higher productivity. This can promote the development of panicles when applied under acidic soil.

Ratooning is widely considered as a strategy to increase lowland rice productivity. However, limited studies have yet been conducted in the Philippines that focus on the fine tuning of this technology. Thus, this study was conducted to evaluate the growth and yield response of main and ratoon crop of lowland rice (PSB R082) to fertilization and to assess the profitability of lowland rice production when grown as main and ratoon crop as influenced by fertilization. Both main and ratoon crop were subjected to the following treatments: T0-No fertilizer application (Control), T1– 90-60-60kgha-1 N, P2O5 and K2O (Inorganic Fertilizer), T2– 10tha-1 Organic Fertilizer, T3– 5tha-1 Organic Fertilizer + 45-30-30 kgha-1 N, P2O2 and K2O. Results revealed that application of inorganic fertilizers at the rates of 90-60-60 and 45-30-30kgha-1 N, P2O5, K2O for the main and ratoon crops, respectively, significantly increased the leaf area index (LAI), number of productive tillers, weight of panicle, number of filled grains and grain yield. The combined application of organic and inorganic fertilizers produced taller plants, heavier straw yield, abundant number of productive tillers, heavy panicle and more filled grains. Plants applied with inorganic fertilizer at the rate of 90-60-60kgha-11 N, P2O3, K2O for the main crop and 45-30-30kgha-1 of N, P2O5, K3O for the ratoon crop resulted in the highest net income.

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This study seeks to determine the effect of N fertilization method on ratoon lowland rice performance, to choose a fertilization method that provides high ratooned yield, and to assess its profitability adopting N fertilization method. The experiment lays out in a Randomized Complete Block Design with three replications and five N fertilization methods as treatments. Method of N application significantly affected the number of days to heading and maturity, plant height, leaf area index (LAI), number of productive tillers hill-1, panicle length and weight, number of filled and unfilled grains panicle-1. This method compensates cost of production of growing ratoon crop than those of the main crop. In fact, the highest profit (PhP25,564.80) was obtained in ratooned plants, which received 60 kg ha-1 N basal + 30 kg ha-1 N topdress application (T3) due to higher grain yield. Thereby, this is an appropriate option that provides high productivity and income for the ratoon growers.

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