Mixed cropping

The intent of this article is to introduce another type of plant into the energy crop mix. Of this new type, I suggest nine specific species. These species come from the center of the plant kingdom, between monocots... 

No use of various cropping system approaches (crop rotation, inter cropping, mixed cropping, improved fallow systems, hedge systems)... 

Root crop the area in West Africa where this farming system is mainly practiced is sandwiched between the "tree crop" and "forest based" systems in the South and the "cereal-root crop mixed" system in the North. A similar strip exists south of Central Africa. 

Feeding is one of the primary factors in producing a superior crop. Mixing nutrient formulas Is part of the art of growing hydroponically. It requires an extensive knowledge of standard organic nutrients and a constant awareness of new nutrients that continually find their way to the marketplace. 

Projection of a given country s consumption can be made on the basis of projections of the nitrogen consumption. For a diversified crop mix one can expect that consumption of K2O should be 50% of nitrogen consumption. 

Method 2. Intimately mix 99 g. of pure phthahc anhydride and 20 g. of urea, and place the mixture in a 1 litre long-necked, round-bottomed flask. Heat the flask in an oil bath at 130-135°, When the contents have melted, eflfervescence commences and graduaUy increases in vigour after 10-20 minutes, the mixture suddenly froths up to about three times the original volume (this is accompanied by a rise in temperature to 150-160°) and becomes almost sohd. Remove the flame from beneath the bath and allow to cool. Add about 80 ml. of water to disintegrate the sohd in the flask. Alter at the pump, wash with a httle water, and then dry at 100°. The yield of phthahmide, m.p. 233° (i.e., it is practically pure) is 86 g. If desired, the phthahmide may be recrystalhsed from 1200 ml. of methj lated spirit the first crop consists of 34 g. of m.p. 234°, but further quantities may be recovered from the mother hquor. 

Mix 42 5 g. of acetone cyanohydrin (Section 111,75) and 75 g. of freshly powdered ammonium carbonate in a small beaker, warm the mixture on a water bath FUME CUPBOARD) and stir with a thermometer. Gentle action commences at 50° and continues during about 3 hours at 70-80°. To complete the reaction, raise the temperature to 90° and maintain it at this point until the mixture is quiescent (ca. 30 minutes). The colourless (or pale yellow) residue solidifies on coohng. Dissolve it in 60 ml. of hot water, digest with a little decolourising carbon, and filter rapidly through a pre-heated Buchner funnel. Evaporate the filtrate on a hot plate until crystals appear on the surface of the liquid, and then cool in ice. Filter off the white crystals with suction, drain well, and then wash twice with 4 ml. portions of ether this crop of crystals of dimethylhydantoin is almost pure and melts at 176°. Concentrate the mother liquor to the crj staUisation point, cool in ice, and collect the... 

Coconut. In 1988, total coconut production was 36,802,000 t, of which 81% was produced in Asia, mainly in Indonesia and the Philippines (157). The coconut is essentiaUy a crop of the lowland tropics (157). On the average, five nuts are required to produce 1 kg of copra, the dried endosperm of the nut. Copra is further processed to obtain coconut oil and copra meal. To produce coconut milk, which is an emulsion of coconut oil and water, grated fresh coconut meat is mixed with hot water and pressed (157). Either poles having an attached sickle-shaped knife or monkeys (158) may be used for harvesting. 

Mixed fertilizers contain two or more of the elements nitrogen, phosphorus, and potassium (NPK), which are essential for good plant growth and high crop yields. This subsection briefly addresses the production of ammonium phosphates... 

P-Acetoxy-5-hydroxy-B-mrcholestan-6-carboxylic Acid 5,6-Lactone (TO)."" A solution of 5 g (0.011 mole) of keto acid (69), 4.4 g of benzoyl chloride and 10 ml of anhydrous pyridine is allowed to stand for 3 days at room temperature. After a short period the mixture turns red-brown and at the end of the reaction the dark semi-solid mass is poured into 200 ml of water and extracted with two 100 ml portions of ether. The ethereal extracts are washed twice with equal portions of 5 % sodium hydroxide and water, dried and the ether evaporated. The red sirupy residue is mixed with 10 ml of methanol and a brown solid separates immediately. After standing for 1 hr the solid is removed by filtration and washed with methanol. A second crop is obtained upon concentration of the filtrate. The combined crops are recrystallized twice from methanol to give (70) as white needles mp 124-125° yield 2.8 g (58 %). 

Misch-barkeit, /. miscibility, -behaiter, m. mixing vessel (tank, drum, etc.), mixer, -be-stand, m. (Agric.) mixed stand, mixed crop, -bleichen, n. mixed bleaching, -bottich, m. mixing tub or trough, -diinger, m. mixed fertilizer compost, -element, n. mixed element (a mixture of isotopes). 

The concentrate was treated with dry acetone (22 liters), the mixture well mixed, and then filtered to remove precipitated solid impurities. Further dry acetone (4 liters) was added to the filtrate, then the product started to crystallize slowly. Crystallization was allowed to proceed at a temperature between 0° and 3°C for 16 hours and then the product (563 g) was collected by filtration. Dry ether (7.5 liters) was added to the filtrate, and after several hours a second crop (203 g) of solid was collected. The two crops were combined to give sodium 2,6-dimethoxyphenylpenicillin monohydrate (766 g, 73%) as a white crystalline solid. 

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