Application of coating urea fertilizer by natural rubber with rice flour on the Ipomoea aquatica growth
Keywords:
Nitrogen, Urea fertilizer, Chinese water spinach, Slow release fertilizer, Grafted copolymerAbstract
Urea fertilizer is widely used for cropping due to its high nitrogen content. However, it is easy to lost to environment through water leaching and sublimation processes. Therefore, this study explored slow-release urea fertilizer by coating with natural rubber (NR) grafted copolymer with rice flour (RF) in various proportions. The proportions of natural rubber (NR) and rice flour (RF) were [100:0], [90:10], [70:30] and [50:50]. Release profile of the coated urea was tested on Chinese water spinach (Ipomoea aquatica) cropping. Complete random design (CBD) was adopted for the experiment with 5 replicates of 1.2 x 2 m2 plot per treatment. Seven treatments were investigated for fertilizer application: Treatment 1: Control (No urea application), Treatment 2: Urea 30 (applying 30 g/plot after 7 days of planting), Treatment 3: Urea 15+15 (applying urea 2 times, 15 g each after 7 and 17 days of planting) and Treatment 4 to Treatment 7, the plots were applied with [100:0], [90:10], [70:30], and [50:50] coated urea, 30 g each after 7 days of planting, respectively. Efficacy of the coating and the resistance to urea release showed that the [50:50] coated urea was well-formed, with no stickiness, surface holes, or gaps, resulting in the slowest release during water soaking. There was no difference in growth indicators for plant which was applied with either Urea 15+15 or coated urea fertilizer. However, the finding in plant applied with the coated [50:50] urea suggested that coated urea could provide the best yields (highest height and above-ground fresh weight) and be able to decrease N loss in soil.
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