高山白萝卜—甜玉米地膜覆盖间作模式栽培试验

为改善长阳高山白萝卜种植效益不高、连作障碍严重等问题,在长阳1 000、1 200、1 400、1 600 m 4个海拔点进行高山白萝卜—甜玉米地膜覆盖试验。试验结果表明,海拔1 200 m的综合产值最高,达4 913.6元/667 m~2,其次是海拔1 400 m,达到4 885.6元/667 m~2。     

Restoration of bottomland hardwood forests across a treatment intensity gradient

Large-scale restoration of bottomland hardwood forests in the Lower Mississippi Alluvial Valley (USA) under federal incentive programs, begun in the 1990s, initially achieved mixed results. We report here on a comparison of four restoration techniques in terms of survival, accretion of vertical structure, and woody species diversity. The range of treatment intensity allowed us to compare native recolonization to direct seeding and planting of Quercus nuttallii Palmer, and to an intensive treatment of interplanting two species that differed in successional status (early successional Populus deltoides Bartram ex Marsh. ssp. deltoides, with the mid-successional Q. nuttallii). Native recolonization varied in effectiveness by block but overall provided few woody plants. All active restoration methods (planting and direct seeding) were successful in terms of stocking. Populus grew larger than Quercus, reaching canopy closure after 2 years and heights after 2 and 5 years of 6 and 12.7 m, respectively. Planted Quercus were significantly larger than direct seeded Quercus in all years, but only averaged 1.4 m in height after 5 years. Interplanting did not seem to facilitate development of the Quercus seedlings. The early success of the interplanting technique demonstrated that environmental benefits can be obtained quickly by more intensive efforts. Native recolonization can augment active interventions if limitations to dispersal distance are recognized. These results should provide landowners and managers with the confidence to use techniques of varying intensity to restore ecosystem functions.     

欧洲水仙与景天类植物间作模式的探讨

[目的]解决欧洲水仙作为地被应用枯萎期地面裸露的问题。[方法]筛选出抗性强的景天类植物进行间作 按照不同间作密度进行种植,观察两种植物的互配性。[结果]欧洲水仙与景天类植物相间作,在种植深度、根系生长上和植物高度上互不影响,没有矛盾 花期不重合,可以延长观赏期 种植密度以15 cm×20 cm为佳。[结论]欧洲水仙是夏花类球根花卉,通过与景天类植物的间作,可以延长其观赏时期,达到一年种植多年观赏的效果。     

计算机在作物套种技术研究中的应用

研究以春玉米、甘薯两套种作物的复合群体结构及其主要施肥技术为对象,把旋转设计和计算机模拟寻优联合应用于两套种作物的多因子农艺优化研究,对产量、效益等量化指标进行综合论证和农艺方案的优化。     

一膜二熟高效模式栽培效应试验

为提高复种指数和土地利用率,实现节本、省工、增产、增收、增效的目的,进行了一膜二熟模式栽培效应试验,设置了单种烤烟(CK)、烤烟套种甘薯、烤烟套种萝卜、烤烟套种白菜、烤烟套种甘蓝5种栽培模式。试验结果表明,烤烟套种白菜产量最高,产值最好,每667 m2产值高达5 750.0元,比对照处理产值增加217.9%。一膜二熟栽培明显增加了单位面积上的产值,是发展高产高效农业的有效途径。     

寒地棚室春季番茄套种分蘖洋葱栽培技术

介绍寒地棚室春季番茄套种分蘖洋葱栽培技术,包括品种选择、播种育苗、定植、定植后管理、采收及病虫害防治等关键技术。     

甘肃兴电灌区油葵与不同作物间作模式研究

对兴电灌区油葵不同间作模式的效益进行了比较。结果表明，油葵不同间作模式的土地当量比（LER）均大于1，即均有间作优势。其中油葵＋马铃薯、油葵＋豌豆、油葵＋胡麻、油葵＋蚕豆模式的生产优势度较高，稳定性较好，有较高的纯收益和产投比，是兴电灌区比较理想的模式。     

柑橘园生草栽培对害虫天敌消长的影响

以化学除草为对照,研究生草栽培条件下橘园主要天敌种类及数量、主要害虫种群动态,统计产量和水果外观商品性。结果表明,柑橘园生草栽培、自然生草栽培和稻草覆盖栽培处理,果园捕食螨、草蛉、瓢虫、寄生蜂和蜘蛛等五大类害虫天敌都有不同程度增长,柑橘园生草栽培增长最明显,而化学除草(对照)处理几乎没增长甚至负增长;3个处理的柑橘产量和质量也都有所提高。     

少花龙葵与芦荟间种对镉胁迫的效应

[目的]研究少花龙葵与芦荟间种对镉胁迫的效应.[方法]通过不同程度镉胁迫的种植培育,研究少花龙葵与芦荟间种模式下镉的分布,考察间种模式下对少花龙葵镉的积累影响,并对其风险评价.[结果]少花龙葵在生长期对镉胁迫有明显的敏感反应,对其株高、叶绿素含量影响不大,略微影响鲜重.土壤镉处理浓度为0.60 mg/kg时,少花龙葵叶子镉浓度明显比单种低,虽间种的芦荟比单种高,但两者叶子符合绿色行标;土壤镉浓度＞ 0.60 mg/kg时,少花龙葵趋向富集镉,吸收系数间种大于单种,风险相对于芦荟更高,芦荟处于更有利和安全的位置.[结论]选取合适的植物间种不失为经济合理的处理低浓度镉土壤的方法,高pH和高有机质含量使Cd2+不容易转移至植物.     

Highly-efficient Stereo-cultivation Model in Kiwifruit Orchards Interplanting Konjak

The kiwifruit orchards with plants growing for over two years were chosen for interplanting of konjak, which takes advantages of complementation of the two plants in terms of habits, reducing water and...