نتایج جستجو برای: seeder
تعداد نتایج: 380 فیلتر نتایج به سال:
We investigated the hypothesis that maritime climatic factors associated with summer fog and low cloud stratus (summer marine layer) help explain the compositional diversity of chaparral in the coast range of central California. We randomly sampled chaparral species composition in 0.1-hectare plots along a coast-to-interior gradient. For each plot, climatic variables were estimated and soil sam...
"Segregated early weaning" (SEW) of pigs reduces exposure to pathogenic bacteria, but upon arrival at grower facilities pigs may be co-mingled regardless of farm of origin. The present study was designed to examine the effect of mixing (social) stress on populations of Salmonella enterica Typhimurium in SEW pigs. Piglets (7 days old; n = 28 in each of 2 replicates) were separated into 2 treatme...
To adapt to the diversity of hybrid rice and meet its requirements precision seeding, a pneumatic seeder with adjustable seeding rates was designed in this study. The employed an independent vortex pump provide air source for seed metering device. According flow device, sub-pipeline general pipeline were designed. performances two types pipelines verified by pressure uniformity tests. results s...
This article focuses on the problems of low operating efficiency, multiple soil working components, poor trafficability, and adaptability current domestic no tillage seeders. Combining with agricultural mode planting wheat corn in double cropping area year, structure seeder is optimized, an intelligent universal one machine, dual use, deep loosening, layered fertilization studied designed.
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