Nitrogen Requirements at Different Growth Stages of Short-duration Pigeonpea (Cajanus cajan L. Millsp)

Kumar Rao, J V D K and Johansen, C and Usha Kiran, M (1995) Nitrogen Requirements at Different Growth Stages of Short-duration Pigeonpea (Cajanus cajan L. Millsp). Journal of Agronomy and Crop Science, 175 (1). pp. 15-28.

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Abstract

The response to N fertilization of a short-duration pigeonpea genotype, ICPL 87, was studied in the field to assess the scope for genetically improving symbiotic N2 fixation by pigeonpea. The field study was undertaken during 1985, 1986 and 1987 growing seasons on Vertisol and Alfisol at ICRISAT Center (peninsular India), Inceptisol at Gwalior (central India) and Entisol at Hisar (northern India) in as non-limiting environmental conditions as possible. Nitrogen fertilizer was applied to the soil at various growth stages to determine when N becomes most limiting. There was a significant response in grain yield to fertilizer N applied at flowering in Vertisol but not in Alfisol, Inceptisol or Entisol. This suggests that biological N2 fixation by short-duration pigeonpea was not adequate to meet N requirements of the crop grown in Vertisol but that it was probably adequate in the other three soil types. These results are discussed in relation to the nodulation and acetylene reductase activity of pigeonpea and also N mineralization potential of different soils. It can be concluded that there is a need for genetic improvement of N2 fixing ability of short-duration pigeonpea grown on heavy textured soils such as Vertisols

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Fertilizer nitrogen;biological nitrogen fixation;short-duration pigeonpea;nodulation;plant growth stage
Subjects:	Mandate crops > Pigeonpea
Depositing User:	Ms K Syamalamba
Date Deposited:	13 Oct 2011 08:54
Last Modified:	13 Oct 2011 08:54
URI:	http://oar.icrisat.org/id/eprint/2355
Official URL:	http://dx.doi.org/10.1111/j.1439-037X.1995.tb01125...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors wish to acknowledge the administration of Jawaharlal Nehru Krishi Viswa Vidyalaya (JNKW) College of Agriculture, Gwalior and Haryana Agricultural University (HAU), Hisar in providing land and facilities for these studies as part of their cooperative arrangements with ICRISAT. We would also like to thank Dr N. P. SAXENA, Dr O. P. RuPELA, Mr C. SIVA RAMA KRISHNA, Mr R. MADHIYAZAGHAN at Gwalior, Dr H. S. TALWAR at Hisar, Mr B. V. S. T. SAI and Mr S. CHANDRAMOHAN at ICRISAT Center for their able technical assistance in field trials, other technical staff of the Crop Physiology unit. Legumes Program, involved in these studies and staff of Soil Fertility Laboratory of the Resource Management Program, ICRISAT, for soil and plant chemical analyses
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