Effect of Variable Rate Application Using Inorganic Liquid Fertilizer on Paddy Leaves Chlorosis
Publication Date : 07/02/2018
Paddy plant shows numerous symptoms due to nutrients deficiency. Chlorosis and leaf burn on paddy plant tend to happen whenever spraying liquid fertilizer is not in the right measurement where chlorosis happened due to application of low fertilizer concentration rate while leaf burn was caused by over spraying of high fertilizer concentration rate. This study used variable rate application (VRA) with solely liquid fertilizer as only source of fertilizer to fertilized the paddy plant and used SPAD chlorophyll meter to measured nitrogen content for fertilizer calculation. The experiment performed in greenhouse and had four treatment rates (50% fixed rate, 100% fixed rate, 150% fixed rate and VRA) that arranged in RCBD design with four replications for each treatment rates. The results showed there was no any sign of leaf burn on the leaves however chlorotic condition was observed on the paddy leaves for all the treatment rates where VRA had the lowest chlorosis. Variable rate application of liquid fertilizer capable to diagnose nitrogen content of paddy leaves accurately and manage to reduce chlorosis symptoms on the leaves compared to uniform application.
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