The phrase "a certain crop of" is correct and usable in written English.
It can be used to refer to a specific group or type of something, often in a context where you are discussing a selection or category.
Example: "In recent years, a certain crop of innovative startups has emerged in the tech industry, changing the landscape of business."
Alternatives: "a specific group of" or "a particular set of".
Winter wheat is not a certain crop, on account of there being so little snow throughout the winter.
A basic econometric supply model explaining acreage of a certain crop is formulated as a function of its own and competing crops' harvest-time prices, input prices, and other exogenous factors.
In other words, if a country's production of a certain crop has only varied by 10percentt from year to year in the past, then it can be expected that it will not vary by more than this amount in the next period.
Propolis from the stingless bee Trigona laeviceps Smith (Hymenoptera: Apoidae) was used in this research since these bees can be commercially cultivated in a sustainable and potentially ecologically friendly manner in artificial hives (with the potential add on value of certain crop plant pollination), and can provide a lot of propolis per hive.
P. agglomerans E325, an EPA approved agent for biocontrol of certain crop diseases, has been genetically modified using plasmid pT3078, which has the bla gene as a marker, to express recombinant EGFP in the foregut of GWSS.
One image from a drone can easily help a farmer monitor what's going on: where to cut back on resources, what needs more attention, and where to grow a certain type of crop.
For a certain type of crop (e.g., corn), the fraction of each tillage type in 1992 was assigned as 0.5, 0.3, and 0.2 to planted areas managed with CT, RT, and NT, respectively.
Summary: According to the GAO, "the law limits the amount of certain crop support payments that any one person can receive.
These payments go to farm businesses that cannot make money in the global market without government help, or they are funneled to people who agree to take certain crops out of production.
Farmers plowed the soil several times, broadcast seeds, and used a certain sequence of cropping and fallowing.
