江南桤木育苗技术的研究

本文研究了江南桤木不同播种量和不同水分管理方法的育苗效果。结果表明，播种量以45kg／hm2量为宜，苗木高生长、地径生长和优质苗产量均优于其他几种处理方法；水分管理以“湿管法”育苗效果最好，苗木的高生长、地径生长和优质苗产量与“水管法”、常规育苗方法间均存在显著差异。     

拱棚叶类蔬菜复种水稻试验研究

为了充分利用宁夏富足的光、热资源,改革创新种植业耕作模式,提高农田复种指数和产出率,宁夏原种场对在水稻插秧前加种一茬全生育期为40～45 d的速生叶类蔬菜进行了试验研究。结果表明:参试的四季小白菜、菠菜、油菜、生菜、茴香、茼蒿等6种蔬菜均达到了商品菜标准,净产值在11 760.0～43 860.0元/hm2,具有很大的推广价值。     

蛋鸡饲料配方的研究与设计

蛋鸡饲料配方的设计是一门严谨的科学，既关系到养殖安全和产出效益，又要兼顾高成本投入下的利润，I还要适应市场需求，有市场竞争力。     

The use of even-chain alkanes sprayed onto herbage as rate of passage markers in goats

An experiment was conducted with Saanen goats fed fresh grass ad libitum to compare ⁵¹Cr-mordanted fibre and even-chain alkanes sprayed onto either grass leaves or stems to estimate faecal output, total mean retention time (TMRT) and parameters obtained from faecal marker concentration curves, such as k₁ (slow rate of passage), k₂ (fast rate of passage) and transit time (TT). ⁵¹Cr-mordanted grass showed the lowest fractional rates of passage (k₁ and k₂) and hence the largest value of TMRT. There were not significant (P > 0.05) differences between even-chain alkanes sprayed onto leaves or stems for k₂, TT and TMRT, but k₁ estimates were higher (P < 0.05) for stems than for sprayed leaves. Despite the marker used, TMRT values were negatively correlated with the level of dry matter intake (r = − 0.81, − 0.80 and − 0.80 for ⁵¹Cr-mordanted fibre and even-chain alkanes adsorbed onto leaves or stems, respectively). Average faecal outputs estimated from faecal concentrations of ⁵¹Cr-mordanted fibre and even-chain alkanes were not different from the actual outputs but there were differences between markers in the accuracy of estimation. The highest mean square prediction error (MSPE) and the poorest correlation between observed and estimated faecal output values corresponded to even-chain alkanes adsorbed onto stems. Values estimated using ⁵¹Cr-mordanted fibre and even-chain alkanes adsorbed onto leaves were significantly correlated with faecal outputs (r = 0.94 and r = 0.92, respectively), with MSPE being greater for the latter marker.     

Lack of agreement between thermodilution and echocardiographic determination of cardiac output during normovolemia and acute hemorrhage in clinically healthy, anesthetized dogs

Objective and hypothesis: To determine whether or not there is agreement between the thermodilution and echocardiographic measurement of cardiac output (CO) during normovolemia and acute hemorrhage. The hypothesis was that there will be agreement between echocardiographic measurement of CO (ECO) and thermodilution measurement of CO (TDCO) during normovolemia and acute hemorrhage. Design: CO was measured by both thermodilution and echocardiography during α‐chloralose anesthesia in dogs before and 15 and 30 minutes following acute arterial hemorrhage. Setting: Laboratory investigation. Animals: Eighteen clinically healthy dogs, weighing 20–25 kg, anesthetized with α‐chloralose. Interventions: Acute arterial hemorrhage of approximately 50% of the total blood volume. CO was measured by thermodilution and echocardiography before and 15 and 30 minutes following hemorrhage. Measurements and main results: Acute hemorrhage resulted in a significant decrease in CO. There was a lack of agreement between the 2 methods to measure CO at each time and at all anatomic points of measurement in the aorta and pulmonary artery. Conclusion: There is a lack of agreement between the 2 methods; thus, determination of CO by echocardiography may not be a clinically useful tool following hemorrhage in dogs.     

"九州意蜂"品系选育及生产性能试验的研究

以安徽本地意蜂为育种素材,通过系统选育与定向选育,采用闭锁集团繁育与蜜蜂人工授精技术,选育出九州意蜂品种配套系,该品种配套系蜂王日有效产卵量高,春繁速度快,群势强,越夏越冬效果好,适应安徽地区生态环境和蜜粉源条件,具有蜂蜜高产、蜂王浆高产、蜂蜜和蜂王浆双高产的生产性能。其“中九州1号”(Eg1)属于蜂蜜高产型优良蜂种,同一花期蜂蜜产量明显高于本地意蜂(E(a)P﹤0.01),“九州2号”(Eg2)属于王浆高产型优良蜂种,同一花期王浆产量明显高于本地意蜂(E(a)P﹤0.01),10-HDA含量最高达2.14;水分、蛋白质、酸度基本接近,“九州3号”(Eg3)属于蜂蜜、王浆双高产型优良蜂种,同一花期蜂蜜、王浆产量均明显高于本地意蜂(E(a)P﹤0.01),适应于现代养蜂生产。     

稻水象甲幼虫发生程度对水稻生长发育及产量损失的影响

稻水象甲幼虫为害水稻根后,导致水稻植株矮缩、发黄、分蘖减少甚至死苗,造成水稻严重减产,本文对稻水象甲发生程度对水稻生长发育及产量损失的影响进行研究。     

24个澳洲坚果品种在广西合山市的早期表现

为筛选出适合广西合山市种植的澳洲坚果品种，在该市建立试验基地，对24个澳洲坚果品种的花穗长度、小花数量、小花座果率、小花成果率和产量等性状进行观察分析。结果表明，Own choice、I-9、900#、695#、788#和II-14等6个品种(系)的性状好，产量较高，可作为合山市早期种植的澳洲坚果首选品种。     

不同叶面肥对优质稻的生长与产量的影响

应用"万代红""百禾乐"及"中国丰"等三种高效叶面肥,在水稻品种玉香占的苗期和大田生长期进行喷施处理.结果表明:与对照相比,苗期喷施叶面肥处理能明显促进秧苗的稳生壮长,增强秧苗干物质积累,提高秧苗的综合素质;在大田生长期适时进行喷施处理,能促进大田水稻早生快发,促进分蘖和有效穗的形成,保持生长健壮,抗病力明显增强;各处...     

长输管道水力瞬变仿真

根据各种管道边界的瞬变方程和管道水击的连锁Ａｌｌｉｅｖｉ方法，针对具有实际元器件和边界的长输管道的不稳定流动，设计了基于特征线差分解法的分析流程和仿真计算程序。利用长输管道水击数值计算所得线路上各节点的瞬态值进行Ｂ样条曲线拟合，实现了水力瞬变过程中线路水力坡降线及某些水力参数变化情况的图形输出 。