Abstract:

To explore a more effective film-mulching cultivation model of sweet potato.Adopting the combining method of field experiment and artificial observation to study the the effect of different cultivation modes on the physiological characteristics and yield of sweet potato.The results showed that: the temperature of black plastic film mode is 2℃ lower than the transparent film and 1℃ higher than non-covered plastic film in 10cm of soil.Ti’s Root yield is 18.0% higher than the transparent film and 20.4% higher than non-covered plastic film. Black plastic film mode have advantage of appropriate soil temperature and the growth of stems- leaves coordination and reasonable leaf area ratio and reasonable distribution of nutrients and higher net assimilation rate, which is the ultimate causes of the higher root yield. And no spraying herbicides, non-polluting, economizing labour. Black plastic film mode will be a new cultivation model of sweet potato.