Effect of leaf nitrogen and water regime on the photosynthetic capacity of kenaf (Hibiscus cannabinus L.) under field conditions
1990
Muchow, R.C. (Commonwealth Scientific and Industrial Research Organisation, St Lucia (Australia). Div. of Tropical Crops and Pastures)
In field experiments, photosynthetic capacity increased hyperbolically with specific leaf N (SLN) and was most responsive at SLN values less than ca. 1.5 g per sq m. Where ample N was applied, crop radiation use efficiency (RUE) and SLN were higher in those plots which previously experienced water deficit than in those that were always fully irrigated. The stimulation in growth following alleviation of water deficit was directly associated with the increase in SLN during water deficit. In particular, N application had much less effect on SLN and consequently RUE than on N uptake, due to lower N partitioning to leaves and higher leaf area index where a high rate of N was applied. The implications for prediction of crop performance are discussed.
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