Crop requirements

Plot size should be large enough to apply the test material, to obtain more than twice the required samples (most crops require a total of 12-kg sample weight) and to be able to use appropriate harvesting equipment. 

Obviously, pollinators are indispensable to most flowering plants. What is more easily overlooked is that they are critical to our own survival as well. Agriculture feeds the world, and about two-thirds of the world s crops require visits by animal pollinators to set fruit and seed. Various kinds of bees pollinate 60 percent of these crop plants, honey bees being the most important single species in this regard. In the United States alone, their contribution to crop pollination is worth billions of dollars every year. 

Any attempt to assess oxidant damage to agricultural crops requires... 

To show the dimensions of the allelochemical effect with all three above-mentioned paradigms before the era of mineral fertilizers, production of a crop required application of 20 tons of manure per hectare later, with mineral fertilizers only several centner per hectare are required, with regulators such as herbicides, 2 to 20 kg, and regulators such as Agrostemin only a few grams per hectare. 

Certain crops require a special climate and soil. Plants native to the American tropical rain forest give coca (Erythroxylum cocoa), avocado (Persea americana), the American counterpart of the mango (Spondias mombin), guava (Psidium guqjava), papaya (Carica papaya), the Brazilian nut (Bertholletia excelsa), and chewing-gum (latex om Achras sapota). 

Leilch. D. Matcking Fertilizer Application to Crop Requirements, Chevron Chemical Company, San Francisco. CA, (Revised periodically). 

In this approach, pheromone-emitting particulates are broadcast onto crops requiring protection from insects the pheromone enters the atmosphere above the crop, and insects find themselves unable to follow the pheromone trails that normally lead them to a mate. The result a sharp drop in mating, greatly reduced reproduction, and fewer of the insect pests to contend with in the future. 

Significant features of each company s system are 1) the method (or formulation) used to release the synthetic chemical disruptant into the atmosphere, and 2) the equipment and adjunct material for applying the pheromonal formulation to the crop requiring protection. 

One of the most critical aspects in the production of fruit and vegetables is harvesting the produce. The potential to spoil the crop and end up getting a lower return is very acute. It is important that growers consider how they will harvest a crop before they grow it. Many crops require specialised techniques to ensure they reach market in the right condition. The most obvious factors are adequate field heat removal, chilled storage and distribution. Shelf life and performance will be severely curtailed if the produce is not subjected to the correct temperature controls. 

Sulfur has been recognized since the mid-1800 s as an essential element in plant nutrition, crop requirements being similar to P needs. Sulfur is also used as a soil amendment in the reclamation of saline and alkali soils. 

The fertilizer industry requires a large amount of nitrogen fertilizers for food crops around the world. Modem hybrid varieties of food crops require... 

Bor-Nitrophoska . [BASF AG] Complex fertiliza with 13% nitrogen, 13% phosphate, 21% potash, 0.1% boron for agric. crops requiring brxon and horticultural crt s not sensitive to chloride. 

Nonlegumes respond to added Mo because of the requirements for Mo by their nitrate reductase enzymes. Molybdenum additions in the presence of high amounts of N in the soil have prevented depressed crop yields due to excess N. Grains such as com, wheat, and rice have shown improved utilization of N following Mo application, but again, not all cultivars have the same Mo requirements. Many crops in the Brassica family respond to added Mo. Some of the early studies describing whiptail in cauliflower also found that different Brassica crops required different amounts of Mo. 

The extraction is done by trickling this extraction solvent into the top of the bed of crop, allowing it to flow downward through the crop, and collecting the extract as it flows out the bottom of the pipe. This extract must be protected from light to prevent its destruction. The extraction of a 200 pound crop requires about 150 gallons of solvent. 

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