富锗酵母培养物对下笼蛋鸡肉品质、肠道菌群及结构的影响

本试验旨在研究富锗酵母培养物对下笼蛋鸡肉品质及肠道的影响。选取505日龄健康的海兰褐壳蛋鸡480只,随机分为4组,每组5个重复,每个重复24只鸡。对照组饲喂基础日粮,试验组在基础日粮中分别添加12、16、20 mg/kg的富锗酵母菌培养物。预试期7 d,正试期为42 d。结果表明:与对照组相比,12、16、20 mg/kg组腿肉的蒸煮损失分别降低45.2%、33.6%、39.7%(P<0.01),pH均高于对照组(P<0.01);16mg/kg组腿肌的亮度(L~*)低于对照组(P<0.05);12、16、20 mg/kg组腿肌的剪切力分别比对照组低44.13%、56.07%、50.60%(P<0.01);各试验组胸肌pH均高于对照组(P<0.01),16mg/kg组的pH高于12、20mg/kg组(P<0.05);与对照组相比,16mg/kg组乳酸菌数量升高(P<0.05);空肠中,各试验组的绒毛长度高于对照组(P<0.01);16、20 mg/kg组绒毛长度/隐窝深度高于对照组(P<0.01)。结果显示,日粮中添加富锗酵母培养物可以改善下笼蛋鸡小肠的形态结构和肠道菌群平衡,提高鸡肉品质,建议添加量为16 mg/kg。     

甘蓝型双低隐性核不育杂交种沪油杂1号的选育

沪油杂1号(原编号SH-19)是利用隐性上位互作核雄性不育系20118A育成的甘蓝型双低杂交油菜品种.20118A的育性由2对隐性重叠基因和1对隐性上位基因控制,基因型为aabbRfRf,临保系的基因型为aabbrfrf,恢复系的基因型为AA__或__BB__.沪油杂1号种子含油量42.43%,芥酸含量0.62%,硫甙含量24.23μmol/g.在上海市油菜区域试验中平均产量2 243.3kg/hm2,比双高对照汇油50增产11.9%,比双低对照沪油15增产3.8%;在上海市油菜生产试验中平均产量2 244.0kg/hm2,分别比对照汇油50增产33.6%,比对照沪油15增产15.9%.     

谷物冷却机回风利用与节能

分析了谷物冷却机采用回风型冷却的节能原理及优点，回风型冷却具有重要的节能意义。     

采种大白菜地膜复盖的研究

为了提高大白菜(B. campestris ssp pekinensis.)种子的产量和质量,我们进行了两年地膜覆盖研究。结果表明:无论直播小株、育苗小株、老株那种采种方式,凡使用地膜覆盖的均比不覆盖的产量增加30％左右,质量也明显的提高;聚乙烯、聚氯乙烯都是良好的地而覆盖材料,在大白菜种子生产中可以取得相近似的效果。     

地膜覆盖对棉枯萎病发生的影响

地膜覆盖显著降低了棉花枯萎病的发病率与病情指数，极显著地提高了棉花的产量。     

酸碱对低活力苜蓿种子萌发及初期生长的影响

以H2SO4，HCl，HNO3及NaOH为激活荆，研究其对低活力苜蓿种子萌发及初期生长产生的影响。结果表明：不同酸碱处理及其时间不同，效果差异明显，但各处理在不同程度上均对苜蓿种子萌发和初期生长有促进作用；尤其是短时间HNO3处理，对激发苜蓿种子活力效果最佳。     

矸酆恐?,垩白率与糙米率、蛋白

Χ灾绷吹矸酆康挠跋焓钦?,直接影响比间接影响大。Study on the correlation between rice quality and agronomic traits of quality riceNIE Cheng rong, WEN Yu hui, WANG Yun bo, CHEN Ming zhong,LI Mei, LIU Dao quan(Agronomy Department, Foshan University , Nanhai 528231,China)The correlative analy     

造纸工业必须走林纸一体化与可持续发展道路

通过对我国造纸工业面临的现状和存在问题的调研、分析，并比较国内外造纸工业发展的现状，认为国内木材市场已经进入供不应求的紧缺阶段，而从国外进口木材，增加了企业的经营成本，又受市场的制约。所以企业通过自身营造集生态效益和经济效益为一体的原料林，是解决目前造纸工业瓶颈问题的现实而有效的途径。因此，造纸工业必须走林纸一体化与可持续发展的道路。     

Seed survival and predation of Anoda cristata in soyabean crops

Anoda cristata is a troublesome annual broad-leaved weed in summer crops in the rolling Pampa in Argentina; seeds are the only source of regeneration of this species. Seed persistence or depletion is the result of survival and loss processes, including predation. The objective of this study was to determine survival at two burial depths in undisturbed soil and predation rates of A. cristata seeds in soyabean crops in different rotations and tillage systems. Survival was discontinuous and decreased to 25% after 35 months, after which no further reduction in survival was observed to the end of the experiment at 96 months. No differences in seed survival between seeds placed on the soil surface and buried 5 cm below the soil surface were found at 80 months, but at later times survival was lower for seeds placed on the soil surface. Predation rates ranged between 0.3% day⁻¹ and 6.7% day⁻¹. Of the models tested, a polynomial regression of the rate of predation with time gave the best representation of seed predation. From January to July, predation was higher in non-tillage plots in the wheat/soyabean rotation. There was no significant difference in predation rates between tillage systems in the soyabean monoculture and no difference between planting densities. Higher crop residue levels in non-tillage plots in the wheat/soyabean rotation was the dominant factor influencing seed predation, probably because such habitat favours the presence of seed predators.     

1QJ-120型浅松机的研究设计

针对旧式浅松机表土作业中秸秆和土壤侧向位移问题,分析和优化了浅松机的技术参数,设计了一种新型的1QJ-120型浅松机。该机适用于旱作保护性耕作播前作业,能够达到除草、整地和提高地温等目的,也可以用于中耕除草作业。