Abstract: In order to make clear the specific time of peanut irrigation and make a reasonable peanut irrigation system,a experiment was conducted with different irrigation treatments to identify the specific irrigation time of peanut at anthesis under the condition of rain and drought shelter.The irrigation times were set at 20,25,30,35,40,45,50 days after sowing,respectively.The characteristics of main stem height,lateral branch length,leaf area,dry matter accumulation and yield of peanut were measured.The results showed that the earlier or later irrigation time at the flowering stage significantly affected the growth characteristics and dry matter accumulation of peanut.Under the influence of soil water stress,the main stem of peanut was shorter,the lateral branches were shorter and the dry matter accumulation was less,but grew rapidly after rewatering.There were no significant differences in the main stem height,lateral branch length and branch number among the treatments at harvest,the average were 59.06 cm,62.72 cm and 6.34,but the main stem height,lateral branch length,plant dry weight and pod dry weight were the highest in irrigation treatment of 30 days after sowing.The irrigation treatment of 30 days after sowing had the highest yield(6 415.25 kg/ha),100-pod weight(298.59 g) and 100-seed weight(112.41 g),other treatments were 4.59%-22.87%,10.55%-22.59%,4.92%-16.84% lower than those.The irrigation in the early flowering stage could ensure the higher soil moisture content in the thriving anthesis,leading to concentrated peanut bloom,more and full pods of single plant,higher hundred pod weight and hundred seeds weight,more yield.Irrigation at flowering stage should not be earlier than 7 days before anthesis,not later than 7 days after anthesis,that is,about 30 days after sowing.Irrigation in advance or in delay would result in soil water content deficit at flowering stage and affect the formation of final yield.

Key words: Peanut, Anthesis, Irrigation, Plant growth, Yield

CLC Number: 

• S565.01

• S152.7