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Improving nitrogen-use efficiency through essential oils’ coated prilled urea in aerobic rice (Oryza sativa L.)-wheat (Triticum aestivum L.) cropping system

KrishiKosh

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Title Improving nitrogen-use efficiency through essential oils’ coated prilled urea in aerobic rice (Oryza sativa L.)-wheat (Triticum aestivum L.) cropping system
Ph.D.
 
Creator HABIB OLLAH KASHIRI
 
Contributor Dinesh Kumar
 
Subject CGR, Coated urea, Dry matter accumulation, NAR, RGR, Aerobic rice
 
Description T-8777
A field investigation was carried out at the Indian Agricultural Research Institute, New Delhi during kharif seasons of 2010 and 2011 on aromatic hybrid rice PRH-10. Combinations of different levels of nitrogen (75 and 150 kg ha-1) and different sources (coated prilled ureas with two kinds of essential oil at 2 thickness) were evaluated in a Randomized Block Design with three replications. The results indicated that the treatments differed significantly in respect of the LAI, dry matter accumulation (DM), CGR, RGR and NAR. Among the treatments, CCPU1000@N150 gave numerically higher number of tillers m-2 and plant height at 60 and 90 days after sowing (DAS) and uncoated prilled urea at 150 kg N ha-1 (PU@150) gave the highest values of LAI and dry matter accumulation at 30 DAS, but at 60 and 90 DAS, highest values were recorded with CCPU1000@N150. Furthermore, coating of prilled urea either with citronella or palmarosa oil at higher thickness of coating (1000 mg kg-1) was more effective than lower thickness of coating (500 mg kg-1) in increasing the DM of rice at both 60 ,90 DAS and at harvest during either years of the present field study. Various sources of N@150 kg ha-1 recorded significantly higher SLW, CGR and RGR than lower level of 75 kg ha-1, irrespective of the N source during the year 2010 at 30, 60 and 90 DAS. CCPU1000@N150 recorded the highest SLW during both the years. CCPU1000@N150 recorded significantly higher CGR at 30-60 DAS and 60-90 DAS over CCPU500@N150, PCPU 500 @N150, PCPU1000@N150. The RGR was highest between 0-30 DAS and decreased consistently with advancement in growth reaching lowest values between 90-harvest. CCPU500@N150 and CCPU1000@N150 maintained numerically higher RGR at most of the growth stages. Between 0-30 DAS high NAR was maintained which drastically reduced during 30-60 DAS and slightly increased thereafter. The application of N to preceding wheat had a non-significant residual effect on NAR in second year of rice.
 
Date 2016-08-22T11:28:25Z
2016-08-22T11:28:25Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73246
 
Format application/pdf
 
Publisher IARI, DIVISION OF AGRONOMY