搜索结果: 1-7 共查到“农学 Why”相关记录7条 . 查询时间(0.092 秒)
Why the whitefly is such a formidable threat to food security
whitefly formidable threat food security
2016/12/27
Researchers have sequenced the genome of the whitefly (Bemisia tabici), an invasive insect responsible for spreading plant viruses worldwide, causing billions of dollars in crop losses each year.The g...
Why was browsing by red deer more frequent but represented less consumed mass in young maple than in ash trees?!
browsing branch model Cervus elaphus Fraxinus excelsior Acer pseudoplatanus
2015/11/26
European ash (Fraxinus excelsior) and sycamore maple (Acer pseudoplatanus) are considered amongst tree species as some of the most attractive forage for red deer (Cervus elaphus). The aim of this pape...
The development of industries and technologies used in agriculture has brought to the known problem of deagrarization in rural areas. By developing tourist activity in rural areas people have possibil...
Why Do Cervids Strip the Tree Bark?
bark stripping cervid Cervus nippon rumen condition selection and seasonality
2009/8/27
We discussed the characteristics of bark stripping occurrence and examined the reasons why cervids debark trees in this review. Cervids selected tree species in bark stripping, and the selection affec...
Why Insecticides Are More Toxic to Insects than People：The Unique Toxicology of Insects
acetylcholinesterase Bt endotoxin chitin synthesis γ-aminobutyric acid receptor
2009/3/6
The unique toxicology of insects provides the safety mechanisms for the major insecticides. The selectivity of insecticidal nerve poisons is attributable to structural differences in binding subsite...
Why Should We Closely Monitor Fecundity in Marine Fish Populations?
fecundity intrinsic rate of population increase life history stock-recruitment reproductive potential
2008/10/21
Reproductive success, best defined as lifetime total offspring to reach maturity, is the product of the number of eggs produced (i.e., fecundity) per season, adult reproductive life span and offspring...
WHY DO POLLINATORS BECOME “SLUGGISH”?NECTAR CHEMICAL CONSTITUENTS FROM EPIPACTIS HELLEBORINE (L.) CRANTZ (ORCHIDACEAE)
Epipactis helleborine toxic nectar morphinan derivatives indol derivatives ethanol
2010/3/23
Eight populations of Epipactis helleborine (L.) Crantz originating from the area of Lower
Silesia in Poland (Central Europe) were examined in respect to composition of their nectar and its influence ...