Drier weather patterns caused the failure of this single crop their civilisation depended upon – a mono-crop dependent upon a constant source of water to survive.
Researchers have said an industry practice of feeding bees corn syrup may spur colony collapse disorder, which could affect the $30 billion crop industry dependent on bee pollination.
Gliessman maintains many crops now dependent on irrigation don't really need it.
Domestication results from the earlier stages of wild plant food production and systematic cultivation, making crops more dependent on humans for survival but also more productive.
In spite of the fact that many of the pre-colonial conditions have changed considerably (democracy instead of monarchy, mass literacy and new crops less dependent on the ritual calendar) the temple's major office holders still perform in many ways as before.
Nutrient requirements for Nitrogen (N), Potash (K2O) and Phosphate (P2O5) differ between crops and are dependent on the previous crop grown (Table 3).
The result of any one crop always varies, dependent on the weather.
Even in the UK, where the scarcity is slightly less urgent, we've raced through this year's crop and are dependent on good weather for 2015's.
For the current crop of Holmeses, dependent on future TV seasons or movie sequels, that kind of recovery is a nonstarter.
The grain yield of crop is highly dependent on the source-sink relationship in which grain or kernel is the photosynthetic sink while the leaves are the primary source.
In general, we use planted acreage (from national agricultural statistical offices) of each crop as a dependent variable in our econometric estimations.1 However, for countries where we do not obtain data on planted acreage, we instead use data on harvested acreage from the FAO of the United Nations, from the United States Department of Agriculture USDAA) or from governmental sources as a proxy.
