how to onion Soils and climate | how to onion Planting systems

onion Soils and climate onion  Planting systems

how to onion Soils and climate:

Onions can be grown successfully on any fertile, well drained, non-crusting soil. The optimum pH range, regardless of soil type, is 6.0 to 6.8, although alkaline soils are also suitable. Onions do not thrive in soils below pH 6.0 because of trace element deficiencies, or occasionally, aluminum or manganese toxicity. Onions are cool-season biennial, and are tolerant of frost. 

                  Optimum temperatures for plant development are between 13 and 24°C, although the range for seedling growth is narrow, 20-25°C. High temperatures favor bulbing and curing.

how to onion  Planting systems:

Three systems of planting may be employed

 how to direct seedling:

                     is preferred and gives excellent results where the season is sufficiently long to provide early prebulbing growth. Transplants: normally have three to five well- formed leaves at transplant time. Transplant leaves are pruned during growth prior to field setting, thereby facilitating handling and increasing plant hardiness. 

  how to sets:    

                       are used in some areas to ensure large bulb size and uniform maturity. Sets are small dry bulbs, approximately 12 mm in diameter, produced the previous season by seeding thickly or growing under conditions favoring rapid bulbing. Any of the above systems may be used for early green onion production. Field preparation: