Preliminary discussion on water stress of spring maize during seedling in Liaoning province

The germination rates of maize Danyu39 and the responses of its root and leaf growth to soil water stress were analyzed by pot experiment under eight treatment of different water supply(soil water contents reach 25%,35%,45%,55%,65%,75%,85% or 95% of holard) in order to discuss the effects of water stress during seeding and seedling on emergence rates and growth of maize.The results indicate that the emergence rates of maize are 11% when soil water contents are less than 45% of holard,i.e.middle and serious drought,so it is not available to sowing.The emergence rates of maize reach 66.7% when soil water contents are 55% of holard,i.e.slight drought.It is available to sow the seeds,but the yield is low.The emergence rates of maize are 77.8%-88.9% when soil water contents reach 65%-85% of holard,so it is suitable to sow the seeds.The emergence rates of maize are 88.9% when soil water contents reach 95% of holard.It is available to sow the seeds,but the effects of more soil water on yield need to be studied further.Thus,soil water contents could be used as sowing index according to the above-mentioned.The effects of water stress on growth and development of maize plant and root system are significant during seedling,especially on root system.