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BACKGROUNDOnions are cultivated as a cash crop in many partsthe world's most cold climate average. This crop has themare activities to do and so provide them with income fromsphere of production to the consumer. In Tanzania,onions are grown in Iringa district KiloloMorogoro border region and in areas along the river Ruaha,Arusha to Babati sirens clips, Kilimanjaro, andKilosa district, Morogoro and Malolo Lumuma clips and someparts of Singida.Soil conditionsOnions need fertile soil, infinite burst,Do not otuamisha water with enough organic matter. Soil conditions inmeasurement of pH should be between 6.0 and 7.0.WeatherWeather appropriate is that of apathy average. Heat needed ittemperatures between 13 to 24 ° C although seedlings innursery degrees is a good temperature 20 to 25 ° C. Higher temperatures are achievedmanufacture of onion and drying.Type of onionsThere are many varieties of onions. These forms can bedifferentiated according to:(I) The color of the outer shell of the onion that is having harvested;(Ii) the taste (sweet or severity) of the onion itself;(Iii) the need for light in fecundity: there are a demandingshort days (light at 10 to 12 per day) and typeihitajio long day (13 to 14 hours of light per day) tobe able to put an onion. The first type is the children growin the tropic.Type Daysmature                             ShapeofonionPalegandaPalewithinRedCreole 150 HalfRed Red flat -brownRedBombay 160 red circlebrightWhite -brownTexasGrano 165 Yellow Sphere(Wafer) WhitePlanting seedlings and plantingGarlic grows more water using seeds in the nurseryand then transplant field. The amount of 3.5 kg of seeds providesenough seedlings to transplant one hectare field.Sowing in the nurseryZinasiwa seed in the nursery prepared well. Seedsis planted at a depth of one centimeter poured slowlyon the lines / drainage well organized. Then the seeds are buriedto sprinkle soil over the seeds contained on the canals.Seeds germinate in 7 to 10 days but this depends on the situationweather. As the seeds can germinate up until the day kuechelewa21 soil during winter. If good weather, seedsdreamed earlier, even within 4 days.Transplant onion fieldSeedlings are transplanted when it is with a height of 15 cm and a thickness1/2 or 3/4 of the pencil on the trunk. These seedlings are fulfilled agebetween 7 to 9 weeks depending on care. Seedlings inapandikizwain the space of a width of 20 to 30 centimeters into spaceThe row is 10 to 15 centimeters.Prepare fieldBefore the transplant well utifuliwe soil and leaves removedabsolutely. Then ridges or pouches are designed to simplifyirrigation.FertilizerVinamahitaji onions serious soil fertility. GrowsWhen you find a good enough amount of manure 25 to 40. tonsha. Fertilizer should be devolved field after transplant, but isbetter if mixed into the soil beforetransplant. Considering produce 18 tons per hectare, oniontakes from the soil, the amount of approximately 66 kg, 1170 kinds of nutrients Nitrogen, Phosphorus and Potassium.So the amount of fertilizer recommended 450 to 565 kg ofNPK fertilizer (10-10-20) per hectare. Manure is kept up to 7 days10 before transplant. Then, it is proposed to set the amount of13 to 18 kg of nitrogen after three to four weeks to increasethe growth of plants. Nitrogen deficiency of nutrientsyou hasten fruiting and reduces the size of an onion.If they keep this nutrient excess increases the size of onionand the thickness of the neck of the onion, characteristics that have diluted the quality.Irrigation:Good irrigation is required to find the best onion. Irrigationthe amount of water that go down one or more centimetersis a good week to get a big onion. Avoid irrigationexcessive or restricted as this could lead tocracks.Weed controlGrowth and harvest the weeds has been affected greatly if left uncheckedearly. Weeds controlled with drugs or hoesmall hand. Sometimes it is a combination of drugs,hoe and kungolea by hand.Control of diseases1. The pink spot disease (Purple blotch)The setting begun as a small spot in the leaf and thenintensifies size and make pink. The essence of the diseaseThis starts from seeds and also remains on the leaves decayof garlic. Type Red Creole shows very difficult effectingthis disease.The pink spot diseaseDecaying onionMethods of controlling this disease are driving cycle (croprotation) long with crops to prevent stagnationwater field. Reducing the concentration of crop andthe use of fertilizers containing calcium, phosphate and potassiumreduces the spread of this disease. On the other hand,the use of nitrogen fertilizers in bulk or for much lessadd a blast of diseases. Viatilifu such as Mancozebmashmbulizi used to prevent this disease.2. Fog of flour (powdery mildew) and the lowest (Downymildew)This disease attacks the leaves of plants and even shamabaniyoung seedlings. White spots on the leaves seems especiallythe principal leaves young plants. White fogoccurs with rapid increases in part or timescool. Germs live in the onion crop residues and mayblown away by the wind. On young plants the diseasecan be controlled by drugs such as mancozeb.3. Decaying onions (bulb rots)This situation can happen field or during storage barn.This disease is most dangerous in the heat and containing clipskutuamisha water. It is advisable to make sure that no farmkutuamisha state of water and also to the store there is a good conditionthe air aroundPestInflux of garlic (Onion thrips), Train of garlic (Onionmaggots) and Worms of garlic (Onion wireworms) are amongthe pests in onion crop.1. Influx of garlic (Onion thrips)These are very minor pests which feed by scraping the topthe leaf and the plant absorb fluids. State leadsfrom white scratches on the leaves of garlic.Attack littering leaves fall and wither. Size ofGarlic is reduced. This is a major problem especially during droughtthan when the humidity.Influx of garlic effects of the influx2. bore white (White grub)This is kind of a huge worm. Hutaga its eggs in rottingstraw and manure and onion fields that lie so closeor on such sites are more at risk.Attacks roots causing plants to wither. Kutifuliaopen field and keep these pests can reduce their number