Use of CropSyst to simulate growth, ETc and N uptake for the development of irrigation and N fertiliser programs in intensive vegetable crop production.

Martinez-Gaitan C.; Gallardo M.; Thompson R. B.Stockle C. O.Granados M. R.Fernandez M. D.Gimenez C.

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Use of CropSyst to simulate growth, ETc and N uptake for the development of irrigation and N fertiliser programs in intensive vegetable crop production.

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Combined systems of drip irrigation and fertigation that are automatically controlled by programmers are commonly used in intensive vegetable production. Such systems are regularly used in substrate-grown crops, and are being increasingly used with soil-grown crops. These systems provide growers with the technical capacity to "spoon-feed" both water and nutrients as required. Doing so would optimise the use of water and N, and minimise deleterious N losses to the environment. Crop simulation models provide a means to effectively use this technical capacity for precise irrigation and N management. The crop simulation model CropSyst was used to simulate crop evapotranspiration (ETc), growth and N uptake of pepper grown in soil. The crop was grown in simple plastic greenhouses, as is widely used for vegetable production in south-east Spain. The FAO radiation equation was used to simulate ETc. This equation was more accurate for the greenhouse conditions than (a) Penman-Monteith and (b) FAO-Pan, which are alternatives available in CropSyst. Crop N uptake was simulated using (i) crop growth estimated from radiation interception and transpiration, and (ii) curves of dry matter to N content that were determined empirically. Following calibration, validations were conducted in different crops. These simulation routines are being incorporated into a management-oriented program decision support system that will enable growers to evaluate and improve water and nitrogen management of vegetable crops grown in plastic greenhouses.

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来源
《Acta Horticulturae》 |2008年第802期|337-342|共6页
作者
Martinez-Gaitan C.; Gallardo M.; Thompson R. B.Stockle C. O.Granados M. R.Fernandez M. D.Gimenez C.;
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作者单位

Dpto. de Produccion Vegetal, Universidad de Almeria, La Canada, Almeria, Spain.;

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原文格式 PDF
正文语种英语
中图分类园艺;
关键词
chillies; evapotranspiration; fertigation; growth; irrigation; nitrogen; nitrogen fertilizers; nutrient uptake; plant development; plant water relations; simulation models; Capsicum annuum; Spain;

Use of CropSyst to simulate growth, ETc and N uptake for the development of irrigation and N fertiliser programs in intensive vegetable crop production.

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