Analysis Of Water Deficit Response And Salt Tolerance Test Of Mung Bean

This paper,the relationship between the response of mung bean growth to water deficit and the salt tolerance of mung bean in HeilongGang Basin was studied.Combined with the actual production,the field experiment carried out 80% and 60% irrigation water loss treatment at different growth stages.With the lower limit of soil water content,According to the standard crop coefficient recommended by FAO-56,referring to the physiological growth characteristics of mung bean,the growth stages are: initial growth period,rapid development period,mid-fertility,and maturity.The test was set up with 10 treatments,three replicates per treatment,and the trial lasted for 90 days from June 5 to September 2.The pot experiment designed the two factors of irrigation amount and NaCl concentration.With the lower limit of contrast treatment(CK)soil water content,The irrigation amount is set to 2 groups.The NaCl concentration was set to 6 groups.The test was set up with 12 treatments,each of which was repeated three times.The trial lasted from May 4 to August 2 for a total of 91 days.Based on the study of water production function and salt tolerance of mung bean,this paper explored the effects of water deficit on the water consumption of mung bean and the growth and physiological indexes of mung bean in different growth stages,and discussed the response law of mung bean under different water and salt stress.The following conclusions:(1)At different growth stages,different levels of water deficiency will average green bean plant height,leaf area and stem diameter growth inhibition produced,and thus affect the yield of the green beans.The mid-fertility period is the most sensitive period for mung bean growth.At this stage,water deficit will have a great impact on yield and plant growth.The mid-term rewatering will largely alleviate the problem of poor plant growth caused by water deficit in the early stage,and it will have a certain compensation effect on plant growth.(2)The yield of CK treatment was the highest in the whole growth period,but the water use efficiency was lower.The other non-irrigation treatments,the mung bean yield decreased to varying degrees,but the water use efficiency increased to varying degrees.(3)The soil moisture of 0~80cm can be effectively utilized by mung bean,and the maximum planned wet layer of mung bean in the middle and late growth period can be 80 cm.(4)Under the condition of insufficient irrigation,the mung bean plants will show a conservative growth pattern and show a response to the stress.At the same time,the increasing salt stress will accelerate the senescence rate of the plants and force the mung beans to enter the maturity stage in advance.(5)Mung bean can alleviate the inhibition of plant growth by regulating the chlorophyll content of plant leaves.When mung bean is subjected to salt stress of NaCl concentration <60 mmol/L,the chlorophyll content increases with salt stress,thus dissipating the leaf Excessive light caused by reduced area can avoid salt damage and cause great damage to plants.However,the chlorophyll regulation ability is limited.After a certain salt tolerance range,the mung bean growth cycle is shortened,the water use efficiency is decreased,and the yield is decreased.(6)Analyze the impact of water loss on production at each stage through model calculation and actual observation data.The water sensitivity coefficient of mung bean growth stages was obtained by regression analysis and the water production function model of mung bean was established.The water deficit sensitivity index indicates that the most sensitive period of mung bean to water is the mid-fertility period.