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苗床内土温的高低,直接影响秧苗根的生长、水分及养分的吸收能力、肥料的分解和利用率等,这一切又影响了秧苗地上部生长发育的好坏。土温过低必然降低根部对水分和养分的吸收能力,长时间过低的土温还易发生萎根和锈根,这也是造成小老苗、病苗,死苗的重要原因。在北方的早春寒冷季节育苗,除创造适宜的气温外,还要创造适宜的土温,土温是培育壮苗不可忽视的一个重要技术环节。
The soil temperature in the seedbed directly affects the growth of the seedling root, the absorption capacity of water and nutrients, the decomposition and utilization of fertilizers and so on, all of which affect the growth and development of the shoot shoots. Soil temperature is too low will inevitably reduce the root of water and nutrient absorption capacity, long time too low soil temperature is also prone to rooting and rust roots, which is also caused by small seedlings, disease vaccine, dead seedlings an important reason. In the early spring cold season in northern nursery, in addition to creating a suitable temperature, but also to create a suitable soil temperature, soil temperature is to cultivate strong seedlings can not be ignored as an important technical aspect.