"3150","12","archive","65",,,"disk0/00/00/31/50","2011-10-24 11:54:05","2011-10-24 11:54:05","2011-10-24 11:54:05","article",,,"show","Library-ICRISAT@cgiar.org",,,"","","","","","","","","","","0",,,"Tobita","S","","","","","","","Tobita","S","","","","",,,,,"","",,,,,"","","ICRISAT(Patancheru)","India","Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics","pub","s1.2","","","restricted",,,"Fertilizer Use Efficiency, Intercropping, Natural, N abudance, Nitrogen Fixation, Pigeonpea, Sorghum,",,,"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.","1994","published",,"Biology and Fertility of Soils","17","4","Springer Verlag",,"241-248",,,,,,,,,,,"TRUE",,"0178-2762",,,,,,"","http://dx.doi.org/10.1007/BF00383976","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","author",,"","",,,,,,"",,,,,,,"",,,,,"",,,,,"","",,,,,"","",,,,,
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