山西草地螟发生预测模糊近似推理模型     

鲁光球  张树堃  刘梅凤 《华北农学报》1988,(3)

模糊近似推理方法是模糊集理论应用前景十分广泛的一种方法.我们用此法为山西草地螟发生预测建立了一个模糊近似推理模型,初步试用效果满意.本文在模型的预报输出中引用了特征展开近似推理方法,大幅度地简化了运算过程;并且使得模型可以带入较多的因素.  相似文献   

Modelling carbon dynamics in mixed grass–red clover swards     

Bengt Torssell  Henrik Eckersten  Alois Kornher  Per Nyman  Ullalena Boström 《Agricultural Systems》2007

Growth and carbon dynamics in mixed grass–red clover leys were simulated using a growth model for pure stands based on radiation use, allocation within plant and loss of biomass. The model and its parameter values were taken from previous applications of the model to pure swards of grass and red clover grown in the same experiment at the same sites and years.  相似文献   

三种禾草萌发期抗旱性研究   总被引：5，自引：0，他引：5  

严青  马玉寿  施建军 《青海畜牧兽医杂志》2006,36(5):11-13

采用蒸馏水及浓度为5%、10%、15%、20%和25%的PEG溶液处理梭罗草、青海草地早熟禾、垂穗披碱草种子,测定其发芽率、苗长、胚根/胚芽比值,以研究PEG对种子萌发的影响。结果显示:PEG浓度为5%时,青海草地早熟禾的相对发芽率出现小幅上升趋势,垂穗披碱草和梭罗草均呈下降趋势;不同处理对胚根/胚芽比值和苗长均有影响,梭罗草受影响小。因此这三种牧草在萌发期抗旱性依次为:梭罗草、青海草地早熟禾、垂穗披碱草。  相似文献   

广元市多花黑麦草品比试验     

杨成勇  张瑞珍  胡萍  洪春容  谢永良 《草业与畜牧》2006,(11):24-27

对8个多花黑麦草品种从生育期、产草量、茎叶比等方面进行了比较研究，结果表明：特高多花黑麦草l产量最高，其干物质产量为19397kg／hm^2；蓝天堂产量次之，其干物质产量为18242kg/hm^2；特优多花黑麦草产量最低，其干物质产量为14770kg/hm^2。从总体上来看，各个品种之间产量有一定的差异，但是产量差异不显著。  相似文献   

The effect of quality of grass and maize silage on the intake and performance of beef cattle     

R.M. Kirkland  D.C. Patterson 《Livestock Science》2006,100(2-3):179-188

A study was undertaken to evaluate the effects of incorporating high (HMS) and low (LMS) maturity maize silages into diets based on low (LGS) and high (HGS) feed value grass silages offered to beef cattle. Seventy-two continental cross-bred steers were used in a 14-week continuous design, randomised block experiment. The six treatments were arranged as a 2 × 3 factorial design incorporating the LGS and HGS offered as the sole forage, along with each of the two grass silages offered in a 60:40 ratio (DM basis) with the HMS and LMS. All diets were supplemented with 3 kg/head/day concentrates. Total daily DM and metabolisable energy intakes were higher (P < 0.001) for diets based on HGS compared to those based on LGS. Intakes were similar (P > 0.05) between diets containing LMS and HMS, both of which were higher (P < 0.001) than diets containing grass silage as the sole forage. Highest DM intakes were recorded with a mixture of HGS and HMS (P < 0.05 or greater). Cattle offered diets containing HGS had higher live-weight gain (P < 0.05), final live weight, carcass gain and carcass weight (P < 0.001) than those offered diets containing LGS. Feed conversion efficiency, assessed on a carcass gain basis, was poorer (P < 0.05) with diets containing LGS compared with those containing HGS, though differences between diets containing either LMS or HMS and GS as the sole forage were not significant (P > 0.05).  相似文献   

一年生黑麦草在不同基肥条件下的生物量研究     

何静  刘晓英  尚以顺  陈海平  李晓华 《草业与畜牧》2006,(12):17-18,33

在不同基肥条件下，测定一年生黑麦草的产草量、根系长度和深度，结果表明：有机肥每667m^2 1200kg＋复合肥每667m^2 100kg作基肥，一年生黑麦草的产草量最高，达到53226．6kg/hm^2，根系最发达。  相似文献   

天祝县草产业发展的制约因素及其对策   总被引：1，自引：0，他引：1  

裴成芳 《中国草地学报》2007,29(4):110-113

通过分析天祝县草产业发展现状，指出天祝县草产业发展存在的问题，提出要大力发展天祝县草产业必须加强天然草原综合改良，科学合理利用草原资源，建立人工草地和牧草种子繁育基地，开发草产品；建立多元化的投入机制，培植草产业开发的龙头企业；进一步完善草地管理制度，全面彻底地落实草原有偿承包责任制；建立信息网络体系，把信息网络纳入畜牧业基础设施建设范围内，建立健全草畜产品信息网络。  相似文献   

稻草砌块砖建造草砖房的结构工艺探讨   总被引：2，自引：0，他引：2  

吴朗  况青梅 《安徽农业科学》2007,35(16):5009-5009,5012

介绍了稻草砌块的制作,对草砖房的结构及施工工艺进行了论述。  相似文献   

基于“三网合一”的基层农户信息服务软件的研制     

丘耘程存刚  周国民 《计算机与农业》2007,(12):63-63,67

本软件综合运用各种最新的信息技术以及主动式网关技术，将无线通讯网、固定电话网和互联网络连接在一起，实现信息的无缝跨接，拓宽了互联网络上应用系统的服务范围。农业专家或农技推广员利、用本软件可以更加方便、快捷地为基层农户提供信息服务，有效的解决了基层农户信息传递的“最后一公里问题”。  相似文献   

草鱼IFNa和IFNd重组蛋白表达、纯化及单克隆抗体制备     

王梓璇  贾钊  邬恺正  朱晓真  王俊亚  冯浩  邹钧 《水产学报》2022,46(11):2053-2065

为系统研究草鱼I型干扰素的合成、分泌和免疫功能,本研究在大肠杆菌中表达并提纯了草鱼IFNa（CiIFNa）和IFNd（CiIFNd）重组蛋白。将CiIFNa和CiIFNd成熟肽分别克隆到pET-21d或pEHISTEVb表达载体上,并转化到大肠杆菌中;IPTG诱导表达得到CiIFNa和CiIFNd成熟肽的包涵体,经过盐酸胍变性、蛋白复性和浓缩后,利用AKTA分子筛层析获得了纯度较高的重组蛋白。用重组蛋白免疫小鼠,通过PEG法诱导得到杂交瘤细胞;将稳定分泌抗体的阳性细胞株的细胞悬液注射入小鼠腹腔,制备腹水抗体并进行纯化。本研究纯化了草鱼CiIFNa和CiIFNd各2株抗体,并采用SDS-PAGE、ELISA、Western blot和免疫荧光法对其进行了较全面的鉴定。研究结果表明CiIFNa和CiIFNd单克隆抗体特异性好、效价高,能够特异识别在大肠杆菌和真核细胞中表达的重组蛋白,且不存在CiIFNa和CiIFNd分子间的交叉识别。本研究制备的单克隆抗体为深入研究草鱼干扰素的细胞来源和蛋白表达规律奠定基础。  相似文献