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Use of a Nitrogen Budget to Predict Nitrogen Losses in Processing Butternut Squash with Different Nitrogen Fertilization Strategies

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dc.contributor.author Van Eerd, L.L.
dc.date.accessioned 2013-10-23T13:45:48Z
dc.date.available 2013-10-23T13:45:48Z
dc.date.issued 2010
dc.identifier.citation Ven Eerd, L.. 2010. Use of a Nitrogen Budget to Predict Nitrogen Losses in Processing Butternut Squash with Different Nitrogen Fertilization Strategies. HORTSCIENCE 45(11):1734-1740. en_US
dc.identifier.issn 0018-5345
dc.identifier.uri http://hdl.handle.net/10214/7599
dc.description.abstract With rising input costs and environmental concerns, growers are seeking methods to minimize nitrogen (N) inputs and off-field N losses while maintaining crop yields. Field studies on processing butternut squash ( Cucurbita moschata Duchesne ex Poir.) were conducted in 2004–2007 at 11 locations in Ontario, Canada, to determine the optimal N rate and estimate potential N losses. Preplant broadcast ammonium nitrate was applied at five rates between 0 and 220 kg N/ha. In contrasting years (i.e., cool/wet versus warm/dry versus average), 64% of sites were nonresponsive to N fertilizer as indicated by no differences in marketable squash yield. In responsive sites, the most economical rate of N (MERN) was between 105 and 129 kg N/ha of N fertilizer, indicating that the Ontario-recommended rate of 110 kg N/ha seems appropriate for responsive sites. At 110 kg N/ha, no yield advantage resulted from using a controlled-release N(CRN) or split-applying ammonium nitrate at preplant and vine elongation at 65 + 45 kg N/ha, respectively, compared with the same amount applied preplant. Apparent N losses(N inputs – N outputs) at harvest were 83 and 29 kg N/ha greater at a fertilizer application rate of 220 kg N/ha than at 0 and 110 kg N/ha, respectively. At 110 kg N/ha, crop removal balance and apparent N loss calculations suggest relatively low risk of N loss from the field during the growing season and after harvest, respectively. However, environmental and economical risks would be minimized if nonresponsive sites could be identified before N fertilizer application. en_US
dc.description.sponsorship Ontario Processing Vegetable Growers; Ontario Ministry of Agriculture, Food, and Rural Affairs; Agri-Food Laboratories Ltd.; A&L Canada Laboratories Inc. en_US
dc.language.iso en en_US
dc.publisher HORTSCIENCE en_US
dc.subject Cucumis moschata en_US
dc.subject most economical rate of nitrogen en_US
dc.subject environmental impact en_US
dc.subject harvest index en_US
dc.subject controlled-release fertilizer en_US
dc.title Use of a Nitrogen Budget to Predict Nitrogen Losses in Processing Butternut Squash with Different Nitrogen Fertilization Strategies en_US
dc.type Article en_US
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