中国—新西兰农产品贸易研究

本文对中国—新西兰农产品贸易进行系统的实证研究。结果表明,在中国—新西兰自由贸易区建立后,新西兰农产品贸易出口优势显著;两国农产品贸易关系紧密,结构具有较大差异,双边有44种农产品具备明显的互补性,中国对新西兰的农产品出口不论在种类上还是在总量上都具备较大的扩展空间;最后针对以上研究结论,提出新形势下推动中国—新西兰农产品贸易的几点建议。     

氮磷钾施用量对灌淤土水稻产量及肥料利用率的影响

在宁夏灌淤土上,利用田间试验研究了氮、磷、钾各3个施肥水平对水稻(宁粳28号)产量、养分累积量及籽粒产量构成因素的影响。结果表明,施用氮、钾肥对水稻产量和养分累积有显著影响;水稻当季氮、磷、钾肥利用率都随着施肥量的增加而降低;穗数和每穗粒数随施氮量的增加而增加,而施磷肥有利于穗粒数的形成,过量施用氮肥还会显著降低水稻千粒质量。本试验水稻氮、磷、钾肥最佳经济施肥量分别为N 254.3、P2O5150.8和K2O 145.6 kg/hm2,获得最高产量的最大施肥量组合分别为N 309.3、P2O5253.9和K2O177.6 kg/hm2。     

灌水量对日光温室黄瓜灌溉水分配的影响

以津育5号黄瓜(Cucumis sativusL)为试材,研究基于经验灌溉量的不同灌水量处理对日光温室黄瓜灌溉水分配的影响。结果表明,灌水量减少有利于减少水分深层渗漏、土面蒸发及土壤储水量,但对植株蒸腾量影响不显著。灌水量减少并没有降低黄瓜产量,反而有增产趋势,下浮25%和下浮50%分别比常规灌溉增产10.5%和15.4%,水分利用效率提高31.7%和71.4%,这一结果表明目前农民经验灌水量远远超过黄瓜的需水量。     

陕西省部分地区非典型性鸡新城疫的诊治研究

对陕西省部分地区规模化蛋鸡养殖场的非典型性鸡新城疫临床诊治情况进行了流行病学调查.对结果分析后发现:因超剂量、不规范免疫;消毒不彻底;饲管不合理;诊治错误,导致该病在部分地区呈高发病率.建议:进行母源抗体检测后进行疫苗预防,发病鸡群可采用中西药结合进行治疗以降低损失.     

浅谈冬小麦节水高产栽培技术

从选种、施肥、播种、管理和收获等方面介绍了冬小麦节水高产栽培技术,以供参考。     

Experimental evaluation and modeling of high temperature drying of sub-alpine fir

Sub-alpine fir is characterized by its high proportion of wet pockets making it difficult to dry. Since it takes longer to dry, mills experience reduced kiln productivity and increased energy consumption. High temperature drying (HTD) can be an effective approach to accelerate the drying process. In this study, three drying schedules, namely, conservative (control), HTD, and HTD and conservative combined (HTD/Cons), were evaluated when drying green sub-alpine fir 2″ × 4″ dimension lumber. The results indicated that: (1) the drying rates in the HTD and HTD/Cons schedules were increased by 31–150% in comparison to the drying rates obtained for the conservative schedule; (2) although drying stresses observed for the HTD schedule were higher than those that were measured for the conservative schedule, no significant difference in drying stresses was found between the HTD/Cons and conservative schedules; (3) warp was reduced in both HTD and HTD/Cons schedules; (4) neither the HTD nor HTD/Cons schedule showed any significant reduction in modulus of rupture (MOR) and modulus of elasticity (MOE) when compared to the values obtained for the conservative schedule. Diffusion coefficients during HTD for sub-alpine fir were determined and it was found that diffusivity increases with temperature. A mathematical model describing the processes of heating and drying under high temperatures was developed. The results of drying tests showed that the predicted drying curves by the model satisfactorily agree with the experimental data.     

四倍体刺槐、国槐和红叶石楠对根癌农杆菌菌株及不同抗生素敏感性研究

以含有RD29A目的基因和NPTⅡ筛选基因的根癌农杆菌菌株LBA4404、GV3101和EHA105侵染饲用型四倍体刺槐(Robinia pseudoacacia)、国槐(Sophora japonica L.)和红叶石楠(Davidson Photinia)的组培苗叶片,研究3个树种对根癌农杆菌菌株和不同抗生素(替门汀和头孢霉素)的敏感性、以及根癌农杆菌菌株对3个树种的侵染能力。结果表明,不同树种、不同根癌农杆菌株和不同抗生素种类均对转化效果产生明显影响,红叶石楠是最佳受体材料,3个菌株侵染后的平均抗性愈伤率为37.0%,其次为国槐,四倍体刺槐最低;根癌农杆菌菌株LBA4404侵染能力最强,3个树种的平均抗性愈伤率达到33.3%、平均分化率达到17.6%;替门汀对农杆菌侵染后的红叶石楠组培叶片抑菌效果最好。     

油橄榄地热床扦插育苗试验

为了完善油橄榄扦插育苗技术,针对云南油橄榄产业发展中传统的油橄榄扦插方法生根率低的问题,进行了地热床扦插油橄榄育苗试验。试验结果表明,采用地热床扦插育苗,插条的平均生根率达66.3%,与冷床(不加地温)扦插育苗比较,生根率提高了37.8个百分点,且插条生根时间提前近20d。     

竹笋膳食纤维的研究与应用

膳食纤维作为"第七类营养素"对人们饮食健康起到越来越重要的作用。该文从竹笋资源的价值及利用趋势出发,对竹笋膳食纤维的用途和食品开发状况进行了阐述。通过对竹笋膳食纤维提取和改良方法的总结分析,提出了今后竹笋膳食纤维研究的发展方向。     

茶黄素研究进展

本文综述说明了茶黄素的来源,结构,功效及研究的进展。