Optimization of Controlled Water and Nitrogen Fertigation on Greenhouse Culture of Capsicum annuum

TheScientificWorldJournal
You-zhen XiangHanmi Zhou

Abstract

This study investigated the effects of different combinations of irrigation and nitrogen levels on the growth of greenhouse sweet peppers, assessing yield, quality, water use efficiency (WUE), and partial factor productivity from applied N (PFPN). By using controlled drip irrigation, the optimal conditions for efficient, large-scale, high-yield, and high quality production of sweet peppers in Northwest China were determined. Using the local conventional irrigation and nitrogen regime as a control (105% ET0, N: 300 kg·hm-2), three alternative irrigation levels were also tested, at 90%, 75%, and 60% ET0. These were combined with nitrogen levels at 100%, as the control, and 75%, 50%, and 25%, resulting in 16 combination treatments. The results show that different supplies of water and nitrogen nutrition had a significant impact on the growth, yield, WUE, PFPN, and quality of fruit. The treatments of W0.90N0.75, W0.90N0.50, W0.75N0.75, and W0.75N0.50 can better maintain the "source-sink" relationship of peppers. They increased the economic yield, WUE, and PFPN. A principal component analysis was performed to evaluate indicators of fruit quality, revealing that the treatment of W0.75N0.50 resulted in the best fruit quality. For gree...Continue Reading

References

Jul 27, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jules Pretty
Jan 27, 2015·The Journal of ECT·Sebastian VockeMichael Grözinger
Sep 12, 2015·The Journal of Craniofacial Surgery·Irene M J Mathijssen

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