Effect of urea supergranule depth of placement in irrigated transplanted rice
1989
Singh, K. | Singh, A.N. | Singh, K.N. (Banaras Hindu Univ., Varanasi (India). Agronomy Dept.)
Field trials were conducted at the BHU [Banaras Hindu University, Varanasi, India] Research Farm during 1984 and 1985 rainy seasons. Urea supergranule (USG) and neem cake USG were placed at three depths (5, 10, and 15 cm) at three N levels (60, 120, and 180 kg N/ha). Soil was sandy loam with pH 7.4, 205.2 kg available N/ha, 13.8 kg available P/ha, and 171.7 kg available K/ha. The crop was irrigated as needed to maintain soil moisture between saturation and field capacity. All the N through USG was applied one week after transplanting of rice variety Jaya, when soil moisture content was between field capacity and soil saturation. USG was applied at specified depths in the center of hills, with the help of a peg. Grain and straw yields were significantly higher with deep point placement of USG; placement 10 cm deep resulted in the highest yields, followed by that at 15 cm and 5 cm. Protein harvest and N uptake were also highest under 10-cm-deep placement. USG treated with neem cake proved somewhat better than USG. Application of 180 kg N/ha gave significantly higher grain and straw yields as well as protein yield and N uptake. None of the interaction effects were significant.
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