eprintid: 3150
rev_number: 12
eprint_status: archive
userid: 65
dir: disk0/00/00/31/50
datestamp: 2011-10-24 11:54:05
lastmod: 2011-10-24 11:54:05
status_changed: 2011-10-24 11:54:05
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@cgiar.org
item_issues_count: 0
creators_name: Tobita, S
creators_name: Ito, O
creators_name: Matsunaga, R
creators_name: Rao, T P
creators_name: Rego, T J
creators_name: Johansen, C
creators_name: Yoneyama, T
icrisatcreators_name: Tobita, S
icrisatcreators_name: Ito, O
icrisatcreators_name: Matsunaga, R
icrisatcreators_name: Rao, T P
icrisatcreators_name: Rego, T J
icrisatcreators_name: Johansen, C
icrisatcreators_name: Yoneyama, T
affiliation: ICRISAT(Patancheru)
country: India
title: Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics
ispublished: pub
subjects: s1.2
subjects: s1.4
full_text_status: restricted
keywords: Fertilizer Use Efficiency, Intercropping, Natural, N abudance, Nitrogen Fixation, Pigeonpea, Sorghum,
abstract: A field experiment was conducted to obtain the N balance sheet for sole crops and intercrops of sorghum [Sorghum bicolor (L.) Moench] and pigeonpeas [Cajanus cajan (L.) Millsp.]. Intercropping gave a significant advantage over sole cropping in terms of dry matter production and grain yield, as calculated on the basis of the land equivalent ratio and area-time equivalent ratio. The N fertilizer use efficiency and atmospheric N2 fixation by pigeonpea were estimated using 15N-labeling and natural abundance methods. The N fertilizer use efficiency of sorghum was unaltered by the cropping system, while that of the pigeonpea was greatly reduced by intercropping. Although intercropping increased the fractional contribution of fixed N to the pigeonpeas, no significant difference was observed between the cropping systems in total symbiotically fixed N. There was no evidence of a significant transfer of N from the pigeonpea to the sorghum. This study showed that use of soil N and fertilizer N by pigeonpeas was almost the same as that by sorghum in sole cropping, indicating the potential competence of pigeonpeas to exploit soil N. However, when N was exhausted by a companion crop in intercropping, the pigeonpea crop increased its dependency on atmospheric N2 fixation. We conclude that knowledge of how N from different sources is shared by companion crops is a prerequisite to establishing strategies to increase N use, and consequently land productivity, in intercropping systems.
date: 1994
date_type: published
publication: Biology and Fertility of Soils
volume: 17
number: 4
publisher: Springer Verlag
pagerange: 241-248
refereed: TRUE
issn: 0178-2762
official_url: http://dx.doi.org/10.1007/BF00383976
related_url_url: http://scholar.google.co.in/scholar?hl=en&q=allintitle%3A+Field+evaluation+of+nitrogen+fixation+and+use+of+nitrogen+fertilizer+by+sorghum%2Fpigeonpea+intercropping+on+an+Alfisol+in+the+Indian+semi-arid+tropics&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=0
related_url_type: author
citation:   Tobita, S and Ito, O and Matsunaga, R and Rao, T P and Rego, T J and Johansen, C and Yoneyama, T  (1994) Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics.  Biology and Fertility of Soils, 17 (4).  pp. 241-248.  ISSN 0178-2762     
document_url: http://oar.icrisat.org/3150/1/JA_1473.pdf