Shed-cultivation with plastic film is one of the effective measures to make up the heat shortage in Heilongjiang caused by climatic zone. The experiments and investigations showed that the proper transplanting time is from may 1 to may 10. The lwoest temperature for tobacco development in the field is about 9.5℃ for NC89 and 7. 5℃ for both G140 and Coker 176. The earlier the transplanting timeis, the more weakly the tobacco plants develop in the late development stages. Too early transplanting makes tobacco...
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