用土壤系统评价陕西的土壤肥力   总被引：1，自引：0，他引：1  

徐明岗  白锦鳞 《土壤肥料》1994,(1):13-15

将土壤系统值应用于陕西土壤肥力评价的结果表明，土壤起始不仅反映了土壤的供肥，而且还提示出土壤的适种性。土壤投入熵可用于确定公肥增产效率，以及估测作物的最佳施肥量。从土壤值可以评价各地区土壤肥力高低的顺序为：关中灌区＞陕南川＞陕南山区和渭北旱塬区＞北丘陵区和风沙区。  相似文献   

现代鸡育种对鸡蛋生产的贡献     

Flock  DK 刘信福 《国外畜牧学(猪与禽)》1992,(2):58-61

  相似文献   

酸性淋溶土上小麦生长中锌和氮的相互作用     

Verma  TS 徐明岗 《国外农学:麦类作物》1991,(2):41-42

  相似文献   

Multiple cytopenias associated with monocytic proliferation in a dog     

Hirsch VM  Mitcham SC  Dunn DK 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1984,13(2):16-20

An unusual combination of blood cytopenias and monocytic proliferation was observed in a dog. Initial hematologic findings included severe thrombocytopenia, neutropenia, mild nonregenerative anemia and apparently normal bone marrow. Subsequently, a severe persistent monocytosis developed and the bone marrow became populated with monocytes and cytophagic macrophages. Splenomegaly was due to reticuloendothelial hyperplasia and extramedultary hematopoiesis. Treatment consisted of splenectomy and azathioprine but the response was poor and the dog was euthanized. Postmortem examination revealed a hypocellular bone marrow which contained moderate numbers of monocytes and plasma cells. Neoplastic proliferation was absent in visceral organs. No definite diagnosis was established; chronic blood cell consumption, perhaps immune-mediated, may have been responsible for the extensive reticuloendothelial hyperplasia and cytophagia.  相似文献   

An engineering profession in retrospect: engineers and electrons     

Allison DK 《Science (New York, N.Y.)》1985,229(4712):457-458

  相似文献   

The ecological niche of the veterinarian     

Blackmore DK 《New Zealand veterinary journal》1983,31(10):167-169

  相似文献   

Electrocardiograms as an aid in assessing the stunning of cattle and pigs     

Blackmore DK 《New Zealand veterinary journal》1989,37(2):59-61

Electrocardiograms (ECG's) were made from cattle and pigs after slaughter using only the left arm and right arm recording electrodes of a portable electrocardiogram with 12 recording electrodes. Functional heart activity was demonstrated in cattle after stunning with a captive bolt, nonpenetrative percussive methods and a head-only electrical technique. Recordings compatible with ventricular fibrillation were made in the majority of cattle and pigs subjected to a head-to-chest form of electrical stunning. In cases where the placement of stunning electrodes was defective, functional cardiac activity could be detected. Movement artefact on the ECG trace associated with epileptiform seizures following head-only electrical stunning was a technical problem. This was reduced by restunning the animal with a captive bolt before taking an ECG. The examination of ECG's made subsequent to slaughter could form an important component of the quality control of Halal slaughter or a slaughter process using the head-to-body electrical stunning techniques. Adoption of this would be facilitated by the development of a more simple and less sensitive electrocardiograph than that used in the present investigation.  相似文献   

Epidemiology of leptospirosis in dairy farm workers in the Manawatu. Part II. A case-control study of high and low risk farms     

Mackintosh CG  Schollum LM  Blackmore DK  Marshall RB 《New Zealand veterinary journal》1982,30(6):73-76

Subsequent to a cross-sectional serological survey of Manawatu dairy farm workers, a case-control study was carried out to investigate the correlation between titres to leptospiral serovars in workers and those in cattle in their herds. A total of 52 herds was investigated, 25 of which were high risk where milkers had titres of 1:96 or greater, and 27 were case-controls where milkers had no detectable agglutinin titres at a minimum serum dilution of 1:24. The serological prevalence of titres to hardjo in cattle on high risk farms (76.5%) was significantly higher (P<0.05) than on the case-control farms (60.0%). The geometric mean titres of seropositive cattle on high risk farms were also significantly higher (P<0.01) than in the cattle from the case-control farms, especially in the younger cohorts. These findings suggest that there was active endemic hardjo infection in the two- to three-year-old cattle on the high risk farms. Titres to pomona were demonstrated in only 5.2% of the cattle from both types of farm. Workers with titres to pomona tended to be from farms on which stock, especially calves, were bought-in and pigs were kept. Conventional measures for protecting milkers from contact with infected urine appeared to be ineffective and it is concluded that prevention of leptospirosis in dairy farm workers can only be achieved by elimination of infection in the herd by vaccination of cattle.  相似文献   

Mycotic dermatitis in ostriches          下载免费PDF全文

Onderka DK  Doornenbal EC 《The Canadian veterinary journal. La revue veterinaire canadienne》1992,33(8):547-548

  相似文献   

Coccidiosis in chickens recorded in alberta between 1973 and 1977          下载免费PDF全文

Lee EH  Onderka DK  Carlson HC 《The Canadian veterinary journal. La revue veterinaire canadienne》1980,21(8):239-240

  相似文献