Relative efficiency of prilled urea, urea supergranules (USG) and USG coated with neem cake or DCD for direct-seeded rice

Sudhakara, K.; Prasad, Rajendra

doi:10.1017/s002185960006189x

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The nitrification of urea-N was probably slowed by DCD thus conserving much of the applied N over winter. Sudhakara and Prasad (1986) found that coating large urea granules with DCD improved the response of rice although to a lesser extent than in this study.…”

Section: Discussioncontrasting

confidence: 61%

Response of Winter Wheat to Fall-Applied Large Urea Granules With Dicyandiamide

Singh¹,

Beauchamp²

1988

Can. J. Soil. Sci.

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Three field experiments were undertaken over a 2-yr period to compare the response of winter wheat to fall-applied large urea granules containing a nitrification inhibitor (dicyandiamide, DCD) with that of commercial urea granules (prills) applied as a top dressing in the spring. The objective was to determine the effectiveness of large urea granules coupled with DCD in conserving N when applied at planting or one month after planting. Granules of 1, 2 and 3 g urea as well as 2 g urea + DCD were compared with commercial urea prills at an application rate of 80 kg N ha−1. Large urea granules, as compared with fall-incorporated commercial urea prills, were effective in conserving N over the winter period especially when applied 1 mo after planting and resulted in yields and apparent N recovery similar to those with top dressed commercial prills applied in the spring. Incorporation of DCD into 2-g granules (50 or 100 g kg−1 urea) further increased the conservation of N fertilizer as reflected by higher yields and greater apparent fertilizer N recovery. Uptake of 15N from 2-g urea granules decreased with distance from the granule. However, plants furthest from spaced large granules were able apparently to obtain sufficient N to reach the yield potential dictated by the weather and soil conditions. Yield and N recovery data indicated that N conservation increased with increasing granule size. Crop response and fertilizer N availability decreased as depth of placement exceeded 10 cm. Placement between the 5 and 10 cm depths appeared to maximize fertilizer N availability. It was concluded that a combination of large urea granules and a nitrification inhibitor (such as DCD) can effectively conserve fall-applied N and result in yield responses and N uptake by winter wheat similar to that with commercial urea prills applied as a top dressing in the spring. Key words: Time of application, yield, 15N recovery, apparent fertilizer N recovery

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Section: Discussioncontrasting

confidence: 61%

Response of Winter Wheat to Fall-Applied Large Urea Granules With Dicyandiamide

Singh¹,

Beauchamp²

1988

Can. J. Soil. Sci.

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“…1). Beneficial effects of N application on yield attributes have been reported by several workers (SHARMA and PRASAD 1980, SUDHAKARA and PRASAD 1986.…”

Section: Resultsmentioning

confidence: 73%

“…Sulphur coated urea (SCU) and neem coated urea (NCU) were no better than prilled urea. SUDHAKARA and PRASAD (1986) have also reported the advantage of a nitrification inhibitor DCD and of USG for direct-seeded rice in respect of panicle weight, b) Grain and straw yield of rice: Nitrogen application upto 300 kg/ha significantly increased grain and straw yield of direct seeded rice (Fig. 1), the difference between each successive level studied were significant.…”

Section: Resultsmentioning

confidence: 77%

“…Under such conditions nitrifica-tion inhibitors such as N-Serve or DCD (SHARMA and PRASAD 1980a, PRAKASARAO and PRASAD 1980, SINGH and PRASAD 1985KARA and PRASAD 1986) are reported to increase the efficiency of prilled urea applied to rice. Nitrification inhibiting properties of neem cake, an indigenous material in India, have been reported (REDDY andPRASAD 1975, THOMAS andPRASAD 1983) and neem cake coated urea has been reported to be superior to prilled urea (REDDY and PRASAD 1977, SINGH et al 1980, SINGH and PRASAD 1985, SUDHAKARA and PRASAD 1986. Similarly urea supergranules (USG) have been reported to be more efficient than prilled urea for transplanted rice .…”

Section: Introductionmentioning

confidence: 99%

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Relative Efficiency of Prilled Urea, Urea Super Granules, Sulphur Coated Urea and Nitrification Inhibitor N‐Serve Blended Urea for Direct Seeded Rice

Thomas

Prasad

1987

J Agronomy Crop Science

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A two year field study conducted at the Indian Agricultural Research Institute, New Delhi, India showed that for direct seeded rice (drilled in moist bed) blending of urea with nitrification inhibitor N-Serve was the most advantageous; it gave significantly higher grain and straw yield nitrogen uptake by rice than urea supergranules (USG), urea briquettes (UB), sulphur coated urea (SCU), neem cake coated urea (NCU) and prilled urea. USG or UB were next in order and significantly superior to SCU, NCU and prilled urea, which were equally effective. Nitrogen application to rice left a significant residual effect on succeeding wheat, but various sources of nitrogen studied did not differ significantly in this respect.

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“…Prasad et al (1970) reported that N losses through leaching could be minimized by increasing the size of the N fertilizer granules or by coating urea with nitrification-retarding chemicals or such materials as sulphur and neem cake. Such coated fertilizers and large granules have increased the efficiency of N uptake of several other crops (Sudhakara & Prasad 1986;Ram et al 1988) and allowed economies of N use in succeeding crops by leaving large residues of fertilizer N (Singh & Singh 1986). Such information is lacking for sugarcane.…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrogen applied through new carriers on yield and quality of sugarcane

1990

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In a field experiment at Lucknow in 1985/87 and 1986/88, the 'new' N carriers urea super granules (USG), neem-cake-coated urea (NCU) and dicyandiamide-treated urea (DCD) and the traditional source of N, prilled urea (PU), were used to supply 150 kgN/ha to the plant crop (first crop after planting) of the cultivar Col 148. The ratoon crop was fertilized at 0 and 150 kgN/ha with PU over all the plant crop treatments. In both plant and ratoon crops, N application increased cane yields but decreased quality: differences in yield resulting from use of the new carriers were not significant, though the fertilizers tended to increase the final plant population density. Uptake and recovery of N were significantly greater using USG, NCU and DCD than using PU. The direct effect of N was 184 kg cane/kg of N applied to the ratoon crop but residual and cumulative effects of N applied to the plant crop on yield and quality of the ratoon crop were small. Adequate direct application of N is therefore suggested for increasing the yields of ratoon cane.

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Relative efficiency of prilled urea, urea supergranules (USG) and USG coated with neem cake or DCD for direct-seeded rice

Cited by 11 publications

References 11 publications

Response of Winter Wheat to Fall-Applied Large Urea Granules With Dicyandiamide

Response of Winter Wheat to Fall-Applied Large Urea Granules With Dicyandiamide

Relative Efficiency of Prilled Urea, Urea Super Granules, Sulphur Coated Urea and Nitrification Inhibitor N‐Serve Blended Urea for Direct Seeded Rice

Effects of nitrogen applied through new carriers on yield and quality of sugarcane

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