不同栽培密度对秋大棚黄瓜生育期及产量的影响

试验以黄瓜为材料,采用随机区组设计,研究了不同栽培密度对秋大棚黄瓜生育期及产量的影响。结果表明,当栽培密度为4000株/667m2时,产量和产值都达到最高。     

Study on Cultural Technologies and Salt-resistance of Nitraria sibirica in Coastal Areas with Serious Salt-affected Soil

In this research, five Nitraria sibirica provenances such as Dayilu were selected to do experiment of salt-resistance, combining fixed plots test with typical plot investigation, measuring survival rate and growth as main indicators. The experiments of main cultural technology were done on Nitraria sibirica in 4 types of site preparation, 3 types of planting, 3 designs for planting density. The Nitraria sibirica experiments for the effects of curbing salt and improving soil were done by testing soil nutrients, salt content, soil physical properties as focal points in typical site of 3-4 years woods. The experiment results showed that the Nitraria sibirica could survive well with soil salt content of 0.6%, and that survival rate declined distinctively as soil salt content exceeded 0.8%. However, high soil salt content did not influence growth in the year of planting. There were obvious differences in salt-tolerance among Nitraria sibirica provenances; Dayilu was the best on salt-tolerance, the other 4 pro     

大豆30 cm平作窄行密植应用技术研究

通过10年的试验数据阐述了大豆30cm平作窄行密植（以下简称“大豆30cm平窄密”）增产增效是非常显著的。还阐述了该项技术的增产机理和技术关键。并且还对该项技术目前存在的问题进行了认真的讨论。     

澳洲坚果引种试种研究初报

澳洲坚果无性系从１９７９年开始引入中国，并在南亚热带作物研究所（南亚所）试种，现已在南亚热带地区七省扩大试种达２００ｈｍ＾２，各地生长均良好，已有少量结果。南亚所植区澳洲坚果１３龄树平均单株年产已达６ｋｇ（壳果），抗寒性良好，在－４℃时仍未受害，病虫害不严重（曾发生过花序枯萎病、速衰病、茎干溃疡病），但风害严重。澳洲坚果的适生温度在１０℃－３０℃，以最冷月（１）平均气温≤１０℃，年降雨量在１０００     

奎屯地区气象要素对玉米播种及苗期的影响

奎屯地区农七师位于天山北麓,准噶尔盆地的西南缘,总面积5986km2,其中作物种植面积120万亩,随着农七师产业结构的调整,2003年实施了“万头澳牛引进工程”,养牛业的发展使农七师畜牧业对玉米的需求量增加,尤其是澳牛养殖业对青贮玉米需求量更大,因此,研究分析气象要素对玉米播种及苗期的影响是重要工作之一。     

宿根花卉的特点及其在园林中的配置

根据宿根花卉种类繁多、色彩丰富、生长稳定、抗逆性强的特点,其在园林中的配置,宜于建花坛、花境,也可群植,与背景树相结合,还可作地被植物代替草坪,也可建单类花卉园.     

Seed survival and predation of Anoda cristata in soyabean crops

Anoda cristata is a troublesome annual broad-leaved weed in summer crops in the rolling Pampa in Argentina; seeds are the only source of regeneration of this species. Seed persistence or depletion is the result of survival and loss processes, including predation. The objective of this study was to determine survival at two burial depths in undisturbed soil and predation rates of A. cristata seeds in soyabean crops in different rotations and tillage systems. Survival was discontinuous and decreased to 25% after 35 months, after which no further reduction in survival was observed to the end of the experiment at 96 months. No differences in seed survival between seeds placed on the soil surface and buried 5 cm below the soil surface were found at 80 months, but at later times survival was lower for seeds placed on the soil surface. Predation rates ranged between 0.3% day⁻¹ and 6.7% day⁻¹. Of the models tested, a polynomial regression of the rate of predation with time gave the best representation of seed predation. From January to July, predation was higher in non-tillage plots in the wheat/soyabean rotation. There was no significant difference in predation rates between tillage systems in the soyabean monoculture and no difference between planting densities. Higher crop residue levels in non-tillage plots in the wheat/soyabean rotation was the dominant factor influencing seed predation, probably because such habitat favours the presence of seed predators.     

1QJ-120型浅松机的研究设计

针对旧式浅松机表土作业中秸秆和土壤侧向位移问题,分析和优化了浅松机的技术参数,设计了一种新型的1QJ-120型浅松机。该机适用于旱作保护性耕作播前作业,能够达到除草、整地和提高地温等目的,也可以用于中耕除草作业。     

Re-defining tillage erosion: quantifying intensity–direction relationships for complex terrain

Abstract. Current tillage erosion models account for the influence of tillage direction in the magnitude of the soil (tillage) transport coefficient. It is argued here that this is counter-intuitive and causes significant problems in modelling tillage erosion in areas of complex terrain. This article examines whether a re-modelling of tillage erosion is possible that separates tillage direction (an interaction with the landform) from the soil transport coefficient (a measure of tillage intensity representing the combination of implement erosivity and soil erodibility). Experimental data for mouldboard ploughing upslope, downslope and cross-slope at Coombe Barton Farm, Devon are examined. Integration of data for all directions into a single relationship, which relates translocation in the direction of tillage to slope in the direction of tillage and translocation perpendicular to tillage to slope perpendicular to tillage, is not possible using previously published methods of analysis. However, when total translocation distance is regressed against the tangent of the slope at 45° to the tillage direction (bisecting the tillage direction and the direction of overturning) it is found that a single relationship can be used to describe tillage in all three directions. Therefore, this relationship is used to determine a single value of the soil transport coefficient ( k _fTa) for constant soil and implement conditions but different tillage directions. This redefinition of tillage is important both for true estimation of tillage erosion severity, the adirectional coefficient being 40% larger than the directional coefficient, and for modelling of tillage erosion in complex terrain. These improvements are vital when tillage erosion simulation is used to direct soil conservation strategies.     

草坪卷的建植与管理

草坪卷以其具有建植速度快，成坪质量高，易于养护管理的优点成了新兴产业，详细介绍了坪地处理、坪地建设以及草坪的管护管理技术。