拌种剂对马铃薯出苗率和产量的影响

为了防治马铃薯苗期病害和系统性病害,提高马铃薯出苗率,促进种苗健康生长,以马铃薯品种尤金885脱毒种薯为试材,研究了拌种剂对马铃薯出苗率和产量的影响。结果表明:农用链霉素100g·hm-2+金雷720g·hm-2+滑石粉21.7kg·hm-2效果最好,出苗率为92.49%,保苗率为92.13%,比对照增产23.7%。     

肉鸡实用基础日粮Fe·Cu·Zn·Mn含量对比研究

按生产中实用配方配制0～3、4～6、7周龄肉鸡基础日粮,测定其中Fe、Cu、Zn、Mn含量并将测定值与计算值进行了比较分析.结果表明:各阶段肉鸡实用基础日粮含Fe 230.4～310.2 mg/kg,Cu 11.9～16.6 mg/kg,Zn 35.1～45.2 mg/kg,Mn 10.4～16.3 mg/kg,与需要量相比,Fe、Cu超标,Zn临界,Mn不足,说明基础日粮中含有一定量的微量元素但不均衡,因此,在确定微量元素补充量时需要考虑基础日粮微量元素水平.测定值和计算值的分析表明,基础日粮中Fe、Zn含量可以由饲料营养价值表加以估计,而Cu、Mn含量需要实际测定.     

多效抗旱驱鼠剂对种苗生长影响研究

用多效抗旱驱鼠剂 ( RPA)对小麦、黄豆、油松、侧柏种子进行浸种、拌种处理 ,结果表明 ,侧柏以林用型 30 0倍浸种和 30倍拌种效果最好 ,油松以林用型 50 0倍浸种和 50倍拌种促长效果更为明显 ,经检验分析 ,差异显著。黄豆、小麦以农用型 4 0 0拌浸种和 4 0倍拌种 ,对其发芽生长有显著的促进作用。以林用型 1 50倍对油松、侧柏进行蘸浆造林 ,能促进苗木生长 ,提高抗旱能力     

Assessment of the influence of phosphate fertilizers on the microbial activity of pasture soils

The objective of the present work was to examine the effects of phosphate fertilizers on the microbial activity of pasture soils. Various microbial characteristics were measured using soils from an existing long-term phosphate fertilizer field trial and a short-term incubation experiment. The measurements included basal respiration, substrate induced respiration, inhibition of substrate-induced respiration by streptomycin sulphate (fungal activity) and actidione (bacterial activity) and microbial biomass C. The long-term field trials was initiated during 1985 to examine the effectiveness of different sources of phosphate fertilizers (single superphosphate, North Carolina phosphate rock, partially acidulated North Carolina phosphate rock, and diammonium phosphate) on pasture yield. The incubation experiment was conducted for 8 weeks using the same soil and the sources of phosphate fertilizers used in the field trial. In the incubation experiment the fertilizer addition caused an initial decrease in basal and substrate-induced respiration but had no effect on total microbial biomass. The initial decline in basal and substrate-induced respiration with the fertilizer addition was restored within 8 weeks after incubation. In the field experiment the fertilizer addtion had no significant effect on basal respiration but increased substrate-induced respiration and microbial biomass C. The short-term and the long-term effects of phosphate fertilizer addition on the microbial characteristies of the soils are discussed in relation to its effects on pH, salt concentration, and the nutrient status of the soils.     

利用硫化碱废渣制备新型多功能悬浮型种衣剂的研究与应用(Ⅰ)--新型多功能悬浮型种衣剂的研究

本文研究了以工业硫化碱废渣与一类丰富的废弃矿物质等为原料,合成新型阴离子表面活性剂--矽力康复合肥在悬浮型种衣剂中的应用,探讨了矽力康复合肥、不同种类的阴离子、非离子表面活性剂对20%的悬浮型种衣剂稳定性的作用及相互作用,确定了最佳复配条件.结果表明:在使用单一组分中,使用矽力康复合肥比其他9种表面活性剂的稳定性高20.2%～141.2%(15 d);在复配体系中,50g/L矽力康复合肥与15g/L乳化剂A复配体系在90 d后的悬浮率仍达到90.4%,比50g/L十二烷基苯磺酸钠与40g/L乳化剂A的复配体系高29%;产品粘度为500～600mpa·s、对种子的包衣均匀度为95.3%,成膜时间为19min,包衣脱落率为7.42%,热贮稳定性均符合标准,并且产品本身还含有大量促进种子生长的必要元素.     

响叶杨优良无性系的选择研究

通过对23个响叶杨无性系地径、树高的方差分析得出:无性系地径生长差异极显著,树高生长差异显著.遗传分析表明:无性系地径遗传力(0.877)大于树高遗传力(0.551),无性系遗传力大于小区遗传力,地径的遗传变异系数(GCV=67.26%)、表型变异系数(PCV=71.81%)大于树高遗传变异系教(GCV=43.35)、表型变异系数(PCV=58.63),地径遗传增量比树高遗传增益大,地径比树高更受遗传因子控制,选择潜力很大.综合抗病性分析:B27、B5、C3、B4、A5这5个无性系表现最为优良.     

氨基酸螯合多元微肥拌种对玉米苗期生长的影响

玉米采用氨基酸螯合多元微肥拌种可显著地促进根系和地上部的生长，拌种后可使玉米地上部和根系的干物重分别提高22.5%和16.8%，根系活力提高72%，叶片光合强度提高56%，氨基酸螯合多元微肥对玉米的适宜拌种浓度为100倍。     

增产菌处理马铃薯的增产效应研究

增产菌不同时期处理马铃薯可明显缩短出苗期，延长苗期和初花期，且室内根和芽条生长量、大田单株主茎数、主茎粗度、单株叶面积和鲜重干重明显优于对照，用增产菌拌种，并在现蕾期和初花期两次根外喷雾，２品种单位面积产量较对照平均提高３７．７２％，块茎淀粉含量平均提高１２．７５％．     

Annual allowable cut for merchantable woody species in a community managed forest in western Kenya

Changes in stand density, basal area, off-take and annual increment were determined from 18 permanent sample plots established in 1997 in Got Ramogi Forest in western Kenya. The plots were assessed in 2003 and 2008. A total of 824 stems ?1.5 m in height were recorded from 43 woody species. Key merchantable woody species comprised 20% of the woody species and 67% of the overall stem density. There was a significant reduction in the overall stand density and in the stem density of key merchantable woody species, but not among other woody species between 1997 and 2008. The basal area decreased significantly among key merchantable woody species, but not for the overall forest. The basal area decreased from 22.6 to 9.7 m² ha⁻¹ for key merchantable woody species. The stand volume of key merchantable woody species decreased from 156 m³ ha⁻¹ in 1997 to 61.7 m³ ha⁻¹ in 2008. The mean annual off-take declined from 10.3 m³ ha⁻¹ year⁻¹ between 1997 and 2003 to 9.1 m³ ha⁻¹ year⁻¹ between 2003 and 2008, while the mean annual increment increased from 2.9 to 3.3 m³ ha⁻¹ year⁻¹. It was predicted that forest recovery would surpass the 1997 stand volume of 156 m³ ha⁻¹ if off-take levels between 10% and 90% of the mean annual increment were adopted. We settled on an annual allowable cut of 80% of the mean annual increment as a compromise between consumptive and conservation interests. We identified over-harvesting as the main cause of the reduction in stem density among key merchantable woody species. A management plan with compartment registers indicating the diversity, abundance and distribution of each woody species was recommended to guide their utilization and monitor their population dynamics.