摘要
通过田间小区随机区组试验研究不同施氮水平再生水灌溉对设施番茄土壤供氮能力和产量的影响,对不同施氮处理再生水灌溉设施番茄关键生育阶段根际、非根际土壤矿质氮和全氮含量、番茄生物量和产量、氮肥利用效率、表观氮素损失量进行对比分析。结果表明:再生水灌溉氮肥减施20%处理和氮肥减施30%处理,番茄关键生育期根际土壤矿质氮含量保持在40mg/kg以上,根际与非根际土壤矿质氮含量差异介于10.47%～12.63%之间,促进了非根际土壤矿质营养向根际土壤迁移;再生水灌溉氮肥减施20%处理和氮肥减施30%处理氮肥利用效率和产量均显著高于常规施氮处理,而土壤供氮能力与常规施氮处理差异不大。因此,再生水灌溉条件下,施氮水平控制在189～216kg/hm2之间,可有效削减0-30cm根层土壤表观氮素损失,提高根际土壤供氮能力,显著提高番茄关键生育阶段氮肥利用效率和番茄产量。
For discussed effects of nitrogen rate on rhizosphere soil nitrogen supplying capacity of greenhouse tomato with reclaimed water,a field experiment was carried out,mineral nitrogen and total nitrogen of rhizosphere and non-rhizosphere soil,plant biomass and yields,nitrogen use efficiency and apparent N loss of key growth stages of different treatments were measured and analyzed.The results indicated that rhizosphere soil mineral nitrogen content remained 40 mg/kg above of tomato key growth stage,mineral nitrogen content differences between rhizosphere and non-rhizosphere soil was 10.47% to 12.63% of reduced 20% and 30% nitrogen rate treatments,so promoted non-rhizosphere mineral nitrogen to rhizosphere migrating,nitrogen use efficiency and yields of reduced 20% and 30% nitrogen rate treatments with reclaimed water irrigation were significantly higher than the conventional nitrogen rate treatment,but the soil nitrogen supplying capacity of reduced 20% and 30% nitrogen rate treatments had no significantly difference than the conventional nitrogen treatment.Thus,nitrogen rate controlling in 189~216 kg/hm2 with reclaimed water irrigation,effectively reduced apparent N loss of 0-30 cm layer,promoted the non-rhizosphere mineral nutrients to rhizosphere migrating,ensured the rhizosphere soil nitrogen supplying capacity,yield and nitrogen use efficiency of nitrogen rate controlling in 189~216 kg/hm2 were significantly improved than conventional nitrogen treatment.
出处
《水土保持学报》
CSCD
北大核心
2012年第3期67-71,77,共6页
Journal of Soil and Water Conservation
基金
青年科学基金项目(51009141)
水体污染控制与治理科技重大专项"典型村镇饮用水安全保障适用技术研究与示范"(2008ZX07425-004)
关键词
再生水
设施番茄
根际土壤
供氮能力
氮肥利用效率
reclaimed water
greenhouse tomato
rhizosphere soil
nitrogen supplying capacity
nitrogen use efficiency
