<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics"^^ . "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" . . "17" . "4" . . "Springer Verlag"^^ . . . "Biology and Fertility of Soils"^^ . . . "01782762" . . . . . . . . . . . . . . . . . . . . . . . . . "T J"^^ . "Rego"^^ . "T J Rego"^^ . . "T P"^^ . "Rao"^^ . "T P Rao"^^ . . "S"^^ . "Tobita"^^ . "S Tobita"^^ . . "T"^^ . "Yoneyama"^^ . "T Yoneyama"^^ . . "C"^^ . "Johansen"^^ . "C Johansen"^^ . . "R"^^ . "Matsunaga"^^ . "R Matsunaga"^^ . . "O"^^ . "Ito"^^ . "O Ito"^^ . . . . . . "Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics (PDF)"^^ . . . . . . . . . . . "Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics (Image (JPEG))"^^ . . . . . . "Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics (Indexer Terms)"^^ . . . . . "HTML Summary of #3150 \n\nField evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics\n\n" . "text/html" . . . "Pigeonpea"@en . . . "Sorghum"@en . .