Evaluation of sulphur amino acid requirement of male Korean native ducklings from hatch to 21 day of age

1. A dose-response experiment was conducted with male Korean native ducklings (KND) to evaluate the total sulphur amino acid (TSAA) requirement from hatch to 21 d of age.

2. A completely randomised design with 7 dietary TSAA concentrations (0.62%, 0.65%, 0.68%, 0.71%, 0.74%, 0.77% and 0.80%) were used with 6 replications per treatment.

3. Body weight (BW) and feed intake were measured weekly to calculate average daily gain (ADG), average daily feed intake (ADFI) and feed conversion ratio (FCR). One duckling per pen (n = 6) was killed by cervical dislocation to weigh empty body and drumsticks at the conclusion of experiment.

4. BW was improved significantly with increasing TSAA content, in a non-linear manner. A significant decrease of FCR was shown with increasing TSAA contents. TSAA requirement was determined by taking a mean value after fitting the data to both a linear-plateau and a quadratic-plateau model. Estimated TSAA requirements were 0.70%, 0.70%, 0.66% and 0.70% for the maximum BW, ADG and ADFI and for the minimum FCR, respectively. Increasing TSAA content improved quantity of full body weight (FBW), empty body weight (EBW) and drumstick weight (DSW), but there was no effect on proportion of DSW in relation to EBW and proportion of EBW to FBW.

5. In conclusion, the growth of male KND during 1 to 21 d of age was improved with increasing TSAA content, suggesting optimal TSAA requirements estimated by two analysis models.     

硫肥对大蒜形态特征、抗病性和产量的影响

[目的]为大蒜种植合理施用硫肥提供科学的参考依据.[方法]以新疆白蒜为试验材料,研究了不同施硫磺处理对大蒜植株株高、假茎粗、单株叶面积、锈病病株率、鳞茎产量和蒜苔产量的影响,[结果]施硫处理是蒜地施硫磺12 kg/667 m~2,与对照不施硫相比,大蒜植株增高7.8;、假茎增粗17.5;、叶面积增大33.3;,大蒜锈病的病株率降低80;,单位面积鳞茎产量增加14.1;、蒜苔产量增加了16.1;.施硫磺在0～12 kg/667 m~2范围内,大蒜产量随施硫量的增加而增加,当施硫量超过12 kg/667m~2时,产量随前者增加而减少.[结论]新疆阿合奇蒜区施用硫磺能促进大蒜的生长发育,增加大蒜的株高、假茎粗和单株叶面积,增强植株抗锈病能力,提高鳞茎和蒜苔产量.     

硫处理在果蔬保藏加工中的利与弊

综述了硫处理技术在果蔬贮藏与加工过程中的作用与优势,讨论了硫处理技术存在的问题。     

呼和浩特市硫酸盐化速率变化规律及防治对策和研究

依据2002年~2006年的监测数据,对呼和浩特市大气硫酸盐化速率的时空变化规律及趋势进行分析,为防治二氧化硫污染制定相应对策提供科学依据。     

马铃薯不同品种氮、磷、钾与硫素吸收规律的研究

以紫花白、夏波蒂、底西瑞为材料,采用田间试验与室内分析测定相结合的方法,对马铃薯不同品种氮、磷、钾、硫素的吸收、分配规律进行了系统的研究,结果表明:①在整个生育进程中马铃薯植株中氮、钾积累量表现为"M"型变化趋势,磷、硫积累量则表现为单峰曲线的变化趋势。②紫花白品种氮硫比随生育进程的推进呈"高-低-高-低"的变化趋势,底西瑞和夏波蒂品种的氮硫比随生育进程的推进呈波状变化,但两品种波峰和波谷出现的时期及次数均不同;紫花白和夏波蒂磷硫比的变化趋势相同,均为波状曲线变化,最大值分别出现在出苗后75d和95d,比值分别为4.60和4.09,底西瑞的磷硫比表现为"高-低-高-低"的变化趋势,出苗后95d时达到一生中的最大值6.34;3品种整个生育期间的钾硫比变化均表现出波状的变化趋势,波峰和波谷出现的次数和时期各不相同。③马铃薯氮、磷、钾素的积累与硫素积累之间存在着极显著的幂函数关系,即马铃薯氮、磷、钾素的积累量随硫素积累量的增加而呈幂函数增加。     

高寒草甸草地水、土、草中氮硫含量冷暖季节的变化

根据青海高原特殊的气候分布特征，把高寒草甸草地绵羊放牧地划分为冷季和暖季。通过测定冷暖绵羊放牧地水、土壤、牧草中氮和硫含量的结果表明：水、土壤、牧草中氮和硫的含量暖季＞冷季（P＜0．05），其中地表水冷季含硫量分别为3．7mg/kg、5.1mg/kg，水中没有检测到氮；牧草中硫含量冷暖季分别为2952mg/kg,3262mg/kg，差异显著（P＜0．05）；牧草中氮含量冷暖季分别为0．62％、1．36％，差异显著（P＜0．05）；土壤氮含量冷暖季分别为0．22％、0．285％，差异显著（P＜0．05）；硫含量冷暖季分别为0．24％、0．37％。     

玫瑰白粉病药剂防治试验

特富灵、硫磺悬浮剂、腈菌唑和三唑酮防治玫瑰白粉病田间试验结果表明：特富灵防治效果最佳,硫磺悬浮剂、腈菌唑、三唑酮次之,药剂间无显著差异.     

贵州喀斯特山区植物土壤C、N、S的分布特征

该文研究了贵州喀斯特山区植物和土壤C、N、S含量特征、垂直变化特征以及植物与土壤C、N、S之间、植物-土壤间C、N、S 的相互关系。结果表明:该区植物C、N、S平均含量分别为45.13%、2.02%、0.61%,C、N含量在正常范围内,但S含量明显高于我国其他地区;不同植物种C、N、S含量存在显著差异,不同土壤上植物C、N、S含量差异不显著;石灰土C、N、S含量均高于黄壤C、N、S含量,但两者的C、N、S含量差异未达到显著程度;植物C、N、S随海拔的变化不明显,而土壤C、N、S均明显地随着海拔增加而增加。相关分析表明:植物C、N、S之间、垂直变化上植物与土壤之间C、N、S的相关关系基本不显著,而土壤C、N、S之间存在较显著的相关关系。      

硫处理在果蔬保藏加工中的利与弊

综述了硫处理技术在果蔬贮藏与加工过程中的作用与优势,讨论了硫处理技术存在的问题。     

Responses of wheat yield,quality and bread-making properties on the sulphur fertilization

This study presents a versatile influence of sulphur (S) application on winter wheat – beginning with the influence on the grain yield and primary quality indices, followed by the one on the bread-making properties of flour and dough, and ending with the one on the quality indices of baked products. Field experiments were conducted at two locations on haplic Luvisol and calcaric Cambisol during five years. S was given as NS-fertilizers on the background of N100 during wheat tillering. Flour and dough properties for bread-making were determined by using a farinograph Brabender. The baking tests were carried out in laboratory conditions. The influence of S on the grain yield and quality, and bread-making properties of wheat depended on the year and location. As the average of field experiments conducted at two locations, the application of S significantly increased the grain yield (r?=?0.960). The increasing yields were accompanied by decreasing contents of wet gluten (r?=?0.825). However, the significant positive (r?=?0.938) effect of the S application on the Gluten index was revealed, which is a good predictor of the baking quality of wheat flour. The S addition by nitrogen fertilization resulted also in a positive shift of the N:S ratio in grains, which is better for the bread-making quality. The significant positive effects of the S application on the dough stability time (r?=?0.898) and on the farinograph quality number (r?=?0.917) were demonstrated. The loaf volume was significantly (r?=?0.842) increasing under the influence of S. Thus, the application of S in parallel with increasing yields improved several bread-making parameters of wheat.