宁夏黄灌区不同高丹草品种的生产性能和饲用价值研究

为了筛选适宜宁夏黄灌区褐色中脉(BMR)高丹草品种,采用随机区组设计,在宁夏黄灌区对引进的5个褐色中脉(BMR)高丹草和常规高丹草品种生产性能、营养成分、干物质体外消化率和中性洗涤纤维体外消化率进行分析,并采用隶属函数法综合评价。结果表明:参试品种在宁夏引黄灌区长势均良好,无大面积病虫害发生,BMRG3干草产量最高,BMRG6株高和鲜草产量最高;BMRG4粗蛋白、粗脂肪含量在参试品种中最高,分别为18.6%和2.4%,6个品种相对饲喂价值大于90,均达到3级牧草标准;BMR高丹草干物质体外消化率和中性洗涤纤维体外消化率比对照常规品种有所增加,但不同品种间差异不显著(P<0.05)。综合评价后得出适宜宁夏黄灌区种植的BMR高丹草顺序为:BMRG4>BMRG3>BMRG2>BMRG6>BMRG5。

宁夏黄灌区退水过程中氮污染特征模拟

宁夏黄灌区是我国商品粮生产基地之一,农业高强度和化肥高投入对灌区水环境和黄河水安全造成了严重威胁。农田退水中氮素迁移流失的网室土柱模拟实验表明：1每次施肥1~2d后（穗肥是1周后）,田面水中全氮量均出现峰值,不断下降后逐渐趋于稳定,全氮量随时间的变化符合对数衰减规律;23次施肥后,种植水稻的土柱各土层渗漏水中的全氮量高于未种植水稻的土柱,水稻根系的发育,一定程度上促进了氮素向下迁移,加剧了氮素流失的风险,水稻收获前控制氮的渗漏损失尤为重要。

宁夏黄灌区专用青贮玉米品种生产性能和营养价值研究

为给宁夏黄灌区选择优良的专用型青贮玉米,采用随机区组设计,在宁夏黄灌区对引进的5个国外品种(CLO131、CLO132、CLO133、CLO134和CLO135)和1个本地品种(金刚青贮50)生产性能、营养成分、干物质和中性洗涤纤维体外消化率进行分析。结果表明:1)引进品种能在宁夏黄灌区正常生长,无大面积病虫害发生。2)品种间株高差异显著(P<0.05),所有引进品种株高低于对照品种(300.3cm),CLO132株高最高,为291.7cm,CLO133株高最低,为254.3cm。对照品种产量为5786.6kg·hm^-2,高于所有引进品种,但差异不显著(P>0.05)。3)品种间粗蛋白、中性洗涤纤维和淀粉含量差异显著(P<0.05),CLO135粗蛋白含量最高,为9.23%;对照组中性洗涤纤维含量最高为33.43%,CLO132、CLO134和CLO135中性洗涤纤维含量均低于30%;引进品种CLO135淀粉含量最高为43.11%;对照品种与引进品种酸性洗涤纤维、粗脂肪、粗灰分和木质素含量差异不显著(P>0.05)。不同品种钙含量差异显著(P<0.05),对照品种钙含量为0.44%高于引进品种。4)品种间体外干物质消化率和中性洗涤纤维消化率差异不显著(P>0.05),CLO135体外干物质消化率和中性洗涤纤维消化率较高,分别为89.08%和58.17%。综合评价得出适宜宁夏黄灌区种植专用型青贮玉米品种顺序为CLO135>CLO134>CLO131>CLO132>CLO133>CK,CLO135作为专用型青贮玉米在宁夏黄灌区进行推广具有最大潜力。

宁夏黄灌区国外饲用高粱品种生产性能及饲用价值研究

旨在评价5个国外饲用高粱品种在宁夏黄灌区生产性能及饲用价值。采用随机区组设计,在宁夏黄灌区对引进的5个国外饲用高粱品种和1个常规高粱品种的生产性能、营养成分、干物质体外消化率和中性洗涤纤维体外消化率进行分析,并采用隶属函数法综合评价。结果表明:国外引进品种在宁夏黄灌区长势良好,无大面积病虫害发生且营养物质含量高,所有引进品种株高均低于对照品种(328.2cm);LWS2的粗蛋白、粗脂肪含量在所有品种中最高,LWS1品种可溶性碳水化合物含量最高,达到19.93g/kg,与对照品种相比差异显著(P<0.05),所有引进品种的中性洗涤纤维含量和酸性洗涤纤维含量均低于对照品种;所有引进品种干物质体外消化率和中性洗涤纤维体外消化率均高于对照品种,其中LWS1含量最高,分别为87.88g/kg和72.91g/kg。隶函数综合评价得出宁夏黄灌区种植饲用高粱品种顺序为LWS1>LWS2>LWS5>LWS4>LWS3>CK。

宁夏黄灌区三倍体毛白杨无性系苗期生长规律研究

对三倍体毛白杨无性系苗期生长发育过程及其生长规律进行了初步研究,并对苗期高生长与气候因子间关系进行了灰色关联分析。结果表明,三倍体毛白杨无性系生长发育具有明显的阶段性,生长进程呈现慢-快-慢的规律,并存在明显的速生期。

Effects of Enhanced Ultraviolet Radiation-B on Maize in Arid Regions of Middle-high Elevation

[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B on maize and providing scientific reference to make proper countermeasures. [ Method] The location test in field and lift lamp of UV-B were used to observe the changes of maize height, leaf area and number of green leaves under influences of different UV-B radiation. [ Result] In arid regions of middle-high elevation, enhanced ultraviolet radiation-B could dwarf maize plant, decrease leaf area, decline number of green leaves and yield. The reason of decreasing leaf area was that enhanced ultraviolet radiation-B shortened leaf length and leaf width while the reason of declining yield was that yield components were all negatively influ- enced and with the increase of ultraviolet radiation-B, the yield declined dramatically. [ Concluslonl The result of this experiment would be good for maize production in arid regions of middle-high elevation.