| 张学军,赵营,任福聪,陈晓群,吴礼树,胡承孝.滴灌条件下施氮量对黄瓜-番茄种植体系中土体NO-3-N淋洗的影响[J].干旱地区农业研究,2007,(4):157~162 |
| 滴灌条件下施氮量对黄瓜-番茄种植体系中土体NO-3-N淋洗的影响 |
| Effect of N rate on soil nitrate leaching in cucumber-tomato rotation system under drip irrigation condition |
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| DOI：10.7606/j.issn.1000-7601.2007.04.30 |
| 中文关键词: 滴灌 黄瓜-番茄轮作 土壤溶液 NO-3-N含量 |
| 英文关键词:drip irrigation rotation of cucumber-tomato soil solution NO-3-N content |
| 基金项目:国家自然科学基金项目（40261007）；宁夏回族自治区自然科学基金项目(ZD3) |
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| 中文摘要: |
| 为了解不同氮肥用量对土壤NO-3-N淋洗的风险程度， 合理指导温棚蔬菜施肥和灌溉，2005～2006年在宁夏引黄灌区滴灌条件下，以轮作体系下的温棚黄瓜-番茄为研究对象，采用田间土壤溶液定位提取、田间试验与室内分析相结合的方法，设化肥施氮量150 kg/hm2(低氮)、300 kg/hm2(中氮)、450 kg/hm2(高氮1)、600 kg/hm2(高氮2)及有机肥和不施肥(CK)处理，研究滴灌条件下施氮量对土体中NO-3-N淋洗的影响。结果表明：无论是低、中或高氮处理下，黄瓜-番茄轮作周期中，滴灌施肥对0～30 cm土壤溶液NO-3-N含量变化的影响明显；在高氮处理下，由于番茄季较强的滴灌量，土体中NO-3-N不断向下淋洗至90 cm土层；与CK处理相比，单施有机肥会造成的土壤NO-3-N向深层淋洗。因此，提出每茬蔬菜推荐施氮量控制在300 kg/hm2左右为宜，在冬春茬后期4～6月份减少滴灌次数是减少土体NO-3-N向下淋洗的措施。 |
| 英文摘要: |
| The objective of this study was to evaluate NO-3-N leaching with different N rate, and to give a scientific fertilization and irrigation suggestion for greenhouse vegetables. An method with field experiment, soil solution collecting and chemical analysis was conducted to study the effects of N rate on NO-3-N leaching under cucumber-tomato rotation system of drip irrigation with greenhouse in Yellow River irrigated area in Ningxia from 2005 to 2006. N rate 150, 300, 450, 600 kg/hm2 was defined by low N rate, middle N rate, high N rate 1 and high N rate 2, respectively. The results showed that drip irrigation or N rate affected significantly NO-3-N content of 0~30 cm soil solution under low, middle or high N rate in cucumber-tomato rotation system. Especially in high N rate, NO-3-N of topsoil solution would leach to 90 cm soil depth because of high drip irrigation in tomato season. Organic manure application may cause NO-3-N leaching to deep soil depth compared to treatment CK. Therefore, it is recommended to keep the application of nitrogen less than about 300 kg/hm2 each vegetable season and to decrease irrigation times in winter-spring tomato season, so as to decrease NO-3-N leaching. |
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