沙地马铃薯不同灌溉方式的经济效益分析

从投资回收期和益本比2个方面,对靖边县沙地马铃薯半固定式喷灌、滴灌、大型喷灌机喷灌3种灌溉方式进行经济效益分析,在经济分析的基础上,采用层次分析法,对3种灌溉方式进行综合效益评价。结果表明,半固定式喷灌、滴灌、大型喷灌机喷灌的投资回收期分别为2.1 a,0.6 a,0.9 a,效益费用比分别为2.6,7.9,7.6,滴灌的经济效益十分明显;3种灌溉方式的优劣排序为:滴灌最好,半固定式喷灌次之,大型喷灌机喷灌较差。

Characterization of Sarcocystis species in domestic animals using a PCR-RFLP analysis of variation in the 18S rRNA gene: a cost-effective and simple technique for routine species identification

Thirteen restriction endonucleases were used to investigate nucleotide sequence variation in the 18S rRNA DNA of 88 individuals from ten Sarcocystis taxa collected as cysts from their intermediate hosts, swine, cattle and water buffalo. A DNA sequence of