Effects of Nitrogen Fertilizer Rates and Irrigation Methods on Growth and Yield of Sweet Corn in Chiang Mai Province
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Abstract
The study on nitrogen fertilizer management and irrigation methods for sweet corn, this study was conducted in farmer’s field at Mae Ai district and in the research field of Faculty of Agriculture, Chiang Mai University, Chiang Mai province during November 2017 to March 2018. The experimental design was a randomized complete block design (RCBD) with 4 replications and 4 treatments as follows: (1) nitrogen application at the rate of 190.75 kg/ha and furrow irrigation system (farmer practice), (2) nitrogen application at the rate of 156.25 kg/ha (site-specific fertilizer management) with furrow irrigation, (3) nitrogen application at the rate of 156.25 kg/ha with drip irrigation and (4) control treatment, non-fertilization and irrigated by furrow. The results revealed that the rate of nitrogen application based on the nutrient requirement of sweet corn and soil analysis data (site-specific fertilizer management) did not affect plant height, leaf greenness value and primary nutrient content in ear leaf, fresh yield and yield quality significantly when compared to farmer practice treatment both in furrow and drip irrigations. The range of ear weight and fresh yield were 410.48-430.10 g/ear, 19.85-20.79 t/ha in farmer’s field and 319.85-367.65 g/ear, 16.87-18.33 t/ha in the research field, respectively. Moreover, the total soluble solids in the kernel were higher than 14 °Brix in both experimental fields. However, the drip irrigation system saved 40% water usage compared to the furrow system in the farmer’s field and saved 58% in the research field.
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