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首页> 外文期刊>Acta Horticulturae >Concurrent evaluation of agronomic and environmental aspects of nitrogen fertilization in cauliflower production
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Concurrent evaluation of agronomic and environmental aspects of nitrogen fertilization in cauliflower production

机译：Cauliflower生产中氮肥农艺和环境方面的同步评价

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Despite major efforts over the past 25 years to decrease nitrogen (N) losses, too high nitrate (N03) concentrations in surface and groundwater from agriculture remain an important environmental concern, especially in field grown vegetable production regions. A stringent limitation of the N fertilizer application rates is accepted to be the best N management strategy to minimize N03 leaching losses. We analyzed Flemish fresh market cauliflower field experiments with various N supplies (2000-2013). Weexamined total and marketable yield quantity and quality and residual soil mineral N (RSMN) to rooting depth (0-60 cm) at harvest in function of the N supply (= N fertilizer application rate + N03-N in the 0-60 cm layer). The results show that the totaland marketable yield quantity were negatively affected at an N supply less than 200 kg N ha1. Nitrogen supply had a larger effect on the score of curd color and crop stand than on leaf color and volume, curd firmness and uniformity. However, small reductions in scores of leaf and curd quality parameters resulted in a rejection of the cauliflower as high standard Flandria class, causing an economic loss. The RSMN of treatments with an N supply ￡ and >200 kg N ha1 was on average 56±42 and 89+82 kg N03-Nha1, respectively. Optimum N supply for the earliest crops will be of the order of 200-250 kg N ha1, while later in the season this optimum should be reduced by at least 50 kg N ha1 as a consequence of higher Nmin at planting, possible N mineralizationfrom crop residues from an earlier crop and differences in N mineralization from soil organic matter. The results indicate that N fertilizer application rates of fresh market cauliflower can be further fine-tuned combining both agronomic and environmental aspects of N fertilization.
机译：尽管过去25年来努力减少氮气（N）损失，但从农业的地表和地下水中过高的硝酸盐（NO 3）浓度仍然是一个重要的环境问题，特别是在田间种植蔬菜生产区域。对N肥料申请率的严格限制是最佳的N管理策略，以最大限度地减少N03浸出损失。我们分析了各种N耗材的佛兰芒新鲜市场花椰菜现场实验（2000-2013）。在N供应的功能中，在收获时，在收获的生根深度（0-60厘米）中，促进总和销售屈服数量和质量和残留的土壤矿物N（RSMN）（= N肥料施用率+ N03-N在0-60cm层中）。结果表明，在低于200公斤的N供应量，总额销售产量量受到负影响。氮气供应对凝乳颜色和作物站点的分数比在叶子颜色和体积，凝固的坚固和均匀性上具有更大的效果。然而，叶片和凝乳质量参数的得分小额减少导致花椰菜作为高标准的佛兰德级级别，导致经济损失。 N供给£和> 200kg N Ha1的处理的RSMN分别平均为56±42和89±82千克N03-NHA1。最佳作物的最佳N供应量为200-250千克NA1，而在本赛季后期后，这种最佳应在种植较高的NMIN时减少至少50kg N HA1，可能会产生n矿化来自较早的作物和土壤有机物质矿化差异的残留物。结果表明，新鲜市场的N肥料应用率花椰菜可以进一步微调N施肥的农艺和环境方面。

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