Open Conference Systems, 3rd KOBI Congress, International and National Conferences

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Optimization of plant nutrient absorption by upland rice through provision of humic acid and micronutrients fertilizer in coastal soil
Yudhy Harini Bertham

Last modified: 2020-11-07


Upland rice (Oryza sativa) plants in coastal areas will face multi stressor i.e nutrient, water, salinity, and strong winds. The application of humic acid and micro nutrients is expected to overcome those obstacles. Three upland rice varieties, namely Inpago 10, Padi Merah, and Padi Putih were treated with humic acid, micronutrient, and recommended inorganic fertilizers (200 kg Urea / ha, 100 kg SP36 /ha, 100 kg KCl /ha). Humic acid was given 2 days before planting by spraying it to the soil surface at a dose of 8 L ha-1. Micronutrient was given by spraying the plants at a dose of 75 g ha-1. Spraying of micronutrientwas carried out three times, at plants flowering, 1 and 2 week2 after flowering. Fertilizer N is given separately, half dose at planting and the rest was applied at 1 month after planting. P and K fertilizers were given at planting time. The experimental results showed that nitrogen nutrient levels of rice plant were affected by interaction of rice varieties with fertilizers. Rice varieties and fertilizers significantly affected levels and uptake of N, P and K nutrients, as well as dry weight. Inpago 10 upland rice treated with humic acid produced the highest N content. Inpago 10 variety had the highest N, P, and K content, however the highest N uptake and dry stover weight were produced by Putih variety. The application of humic acid resulted in higher levels and uptake of N, P, K and dry stover weight compared to micronutrient and recommended fertilizers


humic acid; coastal areas; micronutrient; upland rice