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A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design. Parameters in Hooghoudt's drainage equation. A well known steady-state drainage
Because onions can take more than 5–6 months to reach maturity, many growers with shorter growing windows prefer to grow onions from starter bulbs rather than seed. Onion seeds are cultivated in the spring and the resultant bulbs are harvested in autumn. These bulbs are similar in appearance to the mature onion, but much smaller in size.
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Companion planting of carrots and onions. The onion smell puts off carrot root fly, while the smell of carrots puts off onion fly. [1]Companion planting in gardening and agriculture is the planting of different crops in proximity for any of a number of different reasons, including weed suppression, pest control, pollination, providing habitat for beneficial insects, maximizing use of space ...
It may also be defined as the degree of crowding within stocked areas, using various growing space ratios based on crown length or diameter, tree height or diameter, and spacing. Stand density index is usually well correlated with stand volume and growth, and several variable-density yield tables have been created using it.
Emergence: cotyledon breaks through soil surface. 1. Green shoot visible 2. 010: Cotyledon visible as hook 1: 011: Hook stage: hooked cotyledon green 1: 012: Whip stage: cotyledon has whip-like form 1: 1: Leaf development (Main shoot) 10: 100: Advanced whip stage: whip begins to die off 1: 11: 101: First leaf (> 3 cm) clearly visible 12: 102 ...
For example, if a soil is 70 percent sand and 10 percent clay then the soil is classified as a sandy loam. The same method can be used starting on any side of the soil triangle. If the texture by feel method was used to determine the soil type, the triangle can also provide a rough estimate on the percentages of sand, silt, and clay in the soil.
The cultivation of Vidalia onions started in the early 1930s. The Granex and related varieties are sweeter than other onions, but the unusual sweetness of Vidalia onions is due to the low amount of sulfur in the soil in which Vidalia onions are grown. The Vidalia onion was named Georgia's official state vegetable in 1990.