江南暖地草坪冬季交播技术的探讨

对江南城市暖地型草坪草冬季交播技术如草种选择、播种量、播种时间、播种前坪床准备、交播后草坪管理及需注意解决的问题等进行了探讨，并对将来发展趋势进行了展望。     

冬季施工过程混凝土控制裂缝的预防措施

在我国寒冷地区,冬季建筑工程施工常常出现质量问题,即易出现混凝土裂缝和钢筋锈蚀等现象.该文有针对性地论述了三种预防措施.     

Vegetative propagation of Colutea istria Mill. from leafy stem cuttings

This study investigates the optimal conditions for the vegetative propagation of the multipurpose leguminous shrub Colutea istria from leafy stem cuttings. The conditions examined included 1) the origin of the cutting (apical, medial or basal), 2) indole-3-butyric acid (IBA) treatment (0, 50, 200 or 400 mg/l), 3) the relative humidity of the propagation environment (high or low), 4) wounding base of cutting, and 5) the season in which the cutting was taken. The rooting ability of the cuttings was significantly influenced by all these factors. Winter cuttings obtained from the middle and base of the branch showed a greater rooting capacity than those harvested from the apical area, while autumn cuttings harvested from the middle and apical areas of the branch showed a greater rooting capacity than those harvested from the base. Winter cuttings showed the best rooting capacity than autumn cuttings. IBA treatment (200 mg/l), high humidity (98-100%), and wounding increased the rooting capacity of the cuttings. The sprout of new leaves was higher in basal cuttings, while IBA and wounding also significantly enhanced the root number of rooted cuttings. A method for vegetatively propagating C. istria plants is given.     

干旱地区山杏不同季节造林成果调查分析

通过对干旱山区不同季节山杏造林后的生长情况调查分析,得出:秋季山杏截干深栽造林成活率达92.7%,比春季栽植成活率提高10.5个百分点。     

元谋干热区反季甜脆玉米品种比较

云南元谋引进夏强、美男士、华珍、彩珍、双发等5个甜玉米品种进行品比试验:其中华珍产量最高,为19 110kg/hm2;夏强明显早熟,较其它参试品种提前20d成熟;美男士易感染锈病,植株发病率达97%。     

华北驼绒藜雨季移栽成活率研究

本文是不同季节移栽华北驼绒藜(Ceratoides arborescens)系列研究之一。干旱区春季生态建植有补水之苦,雨季移栽表明,不需坐水或补水,成活率可高达60%,浸根可提高成活率至90%;说明雨季移栽是可行的。移栽植株数日内叶片含水量和叶绿素含量急剧下降、脯氨酸含量骤然升高,含量恢复过程则较缓慢,说明移栽使植株突然损伤,但终能恢复至正常生理状态。     

Effect of Different Rearing Conditions of Indoor and Outdoor in Winter and Summer on Growth Performance and Immune Function of Heijiao MA Chicken

This experiment was conducted to study the effect of different rearing conditions of indoor and outdoor in winter and summer on growth performance and immune function of Heijiao MA chicken.In the winter and summer, 180 Heijiao MA chicken with the age of 35-day-old were chosen and randomly divided into two groups with three replicates per group and 30 chickens per replicate.The Heijiao MA chicken were reared at outdoor and indoor, respectively, and at 49, 63, 77, 91 days the immune organ indexes, serum antibody titers and growth performance were measured.The results showed that:①Whether it was winter or summer, the body weight of Heijiao MA chicken rearing at indoor were higher than that of outdoor, and the difference was significant at experimental stages in winter (P<0.05).There was significant difference only at 77 days old of Heijiao MA chicken in summer (P<0.05), the rest were not significant (P>0.05);②The ADG of outdoor group in summer was higher than that in winter, while the F/G of outdoor group in summer were significantly lower than that in winter (P<0.05).The ADFI and ADG of indoor group were not significantly different between winter and summer (P>0.05).③On immune function, immune organ indexes and ND antibody titer of Heijiao MA chicken of indoor group in winter were higher than outdoor group, while part of immune organ indexes, AI (H5) and ND antibody titers of outdoor group in summer were higher than that of indoor group;And ND and AI (H5) antibody titers in winter were higher than summer.In conclusion, The climate and season were major factors to influence the growth performance and immune function of Heijiao MA chicken.     

3个四季草莓品种在川西高原栽培研究

以圣安德瑞斯、波特拉和蒙特瑞3种四季草莓为材料,在茂县进行夏季栽培比较试验,通过各品种的农艺性状及果实内、外在品质等指标进行分析对比以及灰色关联度分析,结果表明:圣安德瑞斯的长势最好；圣安德瑞斯的果实虽然大而重但糖酸比较低,口感较差,风味偏酸,蒙特瑞的固酸比最高,风味最好； 3个品种加权关联度排名依次为蒙特瑞、圣安德瑞斯、波特拉。结论：在茂县及相应高原区域栽培条件下,蒙特瑞的综合适应性最佳。     

主要农作物秸秆养分资源现状及其肥料替代潜力分析——以安徽省为例

安徽省农作物秸秆资源丰富,充分利用秸秆养分资源对于农田养分投入的合理分配具有重要意义。评估全省主要农作物秸秆还田当季有效养分替代化肥潜力,可为安徽省减肥增效提供科学依据。本研究以安徽种植面积较大的主要农作物水稻、小麦、玉米、大豆、花生和油菜为研究对象,通过查阅安徽省统计数据和公开发表的文献资料,对2017年安徽省主要农作物秸秆数量、秸秆还田率以及还田当季养分利用率进行估算,明晰了全省化肥减施潜力。结果表明:2017年安徽省主要农作物秸秆资源量为4 699.9万t,秸秆资源分布上呈北部和中部较多、南部最少的特征。秸秆养分资源总量为124.8万t,N、P_2O_5和K_2O分别为38.1万t、11.4万t和75.3万t,分别占全省主要农作物养分需求的40.1%、32.1%和68.9%。理论上,秸秆全量还田,且养分充分利用的情况下,秸秆养分替代化肥潜力大。但秸秆养分N、P_2O_5和K_2O当季利用率分别为38.9%、52.3%和69.9%,实际秸秆N、P_2O_5和K_2O养分还田量仅占主要农作物养分需求的15.6%、16.8%和48.2%,分别占农田养分总投入量的8.6%、6.4%和41.4%。通过秸秆还田,全省可减施化肥63.3万t,减施比例为19.8%, N、P_2O_5和K_2O减施比例分别为11.4%、17.2%、40.7%。进一步提高秸秆还田率和当季养分释放率,是推进全省化肥减施增效的有利手段。