秦川肉牛新品系的培育

产于陕西八百里秦川的秦川牛,千百年来一直是关中农业生产的主要动力和粪肥来源,建国后,通过广大科技工作者的通力合作,协同攻关,运用国际育种先进技术,选出优秀公牛,授配主产区大批秦川母牛,配合其他措施,从而加速了秦川牛的选育,使之很快由役用型转变为肉用型,形成了秦川肉牛新品系。经屠宰测定,其肉用,役用性能不仅大大高于５０年代调查时测定的指标,而且其中一些肉用性能指标与国际著名的肉牛品种相比也毫不逊色,     

甘肃南部白桦栽培技术

从白桦的生物学特性、经济价值、栽培技术等方面介绍了白桦的特性及栽培技术,对白桦的大面积栽植具有指导意义。     

松材线虫病防治技术存在问题及建议

就松材线虫病的防治技术所存在的问题以及相应的措施作详细的探讨,使松林资源得到有效的保护。     

早熟高产优质水稻新品种龙粳22的特征特性及栽培要点探讨

[目的]为龙粳22的推广种植提供理论依据。[方法]通过比较龙粳22和对照品种的生长、品质、抗病、抗冷指标,探讨了龙粳22的生产潜力和推广价值。[结果]龙粳22主茎11片叶,生育期130d左右,需≥10℃活动积温2300℃左右;幼苗长势强,秆强抗倒,耐寒;3年区域试验平均产量8.37t/hm2,比对照品种增产4.0%;生产试验平均产量9.53t/hm2,较对照品种平均增产9.0%;米质优良,各项指标均达国家优质米标准。[结论]龙粳22熟期早、产量高、米质优,在黑龙江省第3积温带具有较好的推广应用前景。     

Restoration of Gypsicolous Vegetation on Quarry Slopes: Guidance for Hydroseeding under Contrasting Inclination and Aspect

The establishment of gypsicolous vegetation of high conservation value on land impacted by quarrying requires restoration measures to overcome constraints imposed by the new landforms created in the process. The aim of this study was to assess the suitability of three standard hydroseeding methods to restore gypsicolous vegetation on quarry spoil slopes under a dry Mediterranean climate. The treatments were as follows: paper cellulose mulch, paper cellulose mulch + organic blanket, and wood fibre mulch, compared against a control. These treatments were tested on two slopes (10–15% vs 60–65%) and two contrasting aspects (north vs south). We evaluated the cover of all plant species 2·8 years after treatment, assessing both target gypsicolous species and non‐target species. Our results showed strong compositional and cover differences between hydroseeded and control plots. Control plots had a low cover of target species with a vegetation composed of early‐successional species that had the potential to hinder target species establishment over time. All hydroseeding treatments improved target vegetation cover, with wood fibre performing best in most situations studied here, alternatives being the cheaper but less effective paper mulch on shallow slopes, or the more expensive paper mulch + blanket on steep slopes in case of high erosion risk. Shallow and southern‐steep slopes were more suitable for the recovery of gypsum vegetation by hydroseeding, compared to northern‐steep slopes where non‐target species developed more readily outcompeting target species. These results will help to guide management decisions to restore gypsicolous vegetation by hydroseeding in disturbed gypsum habitats. Copyright © 2017 John Wiley & Sons, Ltd.     

Classification of pedogenic cementation in Podzols by pocket penetrometry

According to the German Soil Taxonomy, the formation of cemented horizons in Podzols is restricted to the precipitation of iron oxides. However, in iron‐poor sandy substrates, also illuviation of only organic compounds can form cemented horizons with penetration resistances of up to 14 kg cm⁻². We present a reproducible field test for classifying pedogenic cementation in Podzols and suggest considering cemented horizons (Bmh and Bhm) in the upcoming edition of the Guidelines for Soil Mapping.     

秋延迟中小棚芹菜栽培技术

中小棚秋延后芹菜是河南省蔬菜的主要栽培类型,栽培好延后的芹菜需要选用适宜品种,培育壮苗,秧苗基本达到适龄壮苗标准,应及时安排定植,覆盖草苫等不透明覆盖物后,要根据天气状况及时揭盖草苫、苇毛苫,当芹菜植株高达60.0cm以上时,可根据市场需要,选晴暖天气收获上市。     

康氏粉蚧生活习性及防治技术

康氏粉蚧每年在东宁县发生2代,其越冬卵孵化与5月份平均气温有相关性,平均温度越高卵孵化时期越早越集中,化学防治的关键时期是越冬卵孵化盛期,由于其体表被有蜡质,只有采取综合防治措施才能取得较好的防治效果.     

高职学生英语听力训练的问题与对策

详细阐述了听力训练在高职学生的英语学习中的重要作用以及高职学生在英语听力训练中存在的问题及采用的对策与方法。