Field Experiment Study On Peanut Regulated Deficit Irrigation In Western Liaoning

Peanut is an important economic crop,which is closely related to China's economic development,and water shortage is seriously affecting the sustainability of peanut ecosystem.The main peanut producing areas in Liaoning Province are concentrated in the arid and semi-arid regions of western Liaoning.The peanuts are often exposed to extreme weather such as drought and little rain.How to stabilize peanut yield and improve water use efficiency under the condition of limited water resources is the main task of peanut production in western Liaoning.Regulated deficit irrigation is an irrigation method that utilizes the physiological characteristics of crops and effectively uses water to increase yield.It is widely used in fruit trees and most dry crops.In the past,the research on regulated deficit irrigation was mostly concentrated in the single growth period,and the research on the regulation of polygenerational growth was rare.Therefore,in order to explore the effects of regulated deficit irrigation on the growth and development of peanuts during continuous growth period,and tapping the water-saving potential of peanuts,the“Xiaobaisha 1016”was used as the experimental material,and the two-factor field crack test was used to study the continuous period of flowering and pod-forming.Effects of different degrees of water deficit during growth period on peanut growth,net photosynthetic rate,transpiration rate,yield and water use efficiency,and osmotic adjustment under drought-rehydration-re-drought conditions were explored during the flotation period The process of changes in matter,net photosynthetic rate,and transpiration rate.The main test results are as follows:?1?The height of each treated plant in the growth period of peanut showed“S”growth,and the main stem height was the highest in H₃J₃ treatment?light water deficit in continuous flowering stage and pod-forming period?,and the peanut leaf area was the largest,compared with H₂J₂.The treatment?moderate water deficit in the continuous growth period of flowering and pod-forming period?increased by12.67%,and the difference was significant.H₁J₃ treatment?severe water deficit in flowering stage,mild water deficit in pod-forming period?peanut leaf area compared with H₁J₂ treatment?severe water deficit in flowering stage,moderate water deficit in pod-forming period?,H₁J₁ treatment?flowering period?The severe water deficit in the continuous growth period of the pod-forming period increased by 26.44%and29.51%,respectively,and the difference was significant?2017?.The total surface area of roots treated by H₁J₁ was the largest,which was 36.54%higher than that of H₃J₃ treatment,and the difference was significant?2018?.In the full fruiting period of 2017,the total dry matter accumulation of H₂J₂ treatment?moderate water deficit in continuous growth period?was more than 51.63%compared with H₁J₁ treatment?severe water deficit in continuous growth period?,and the difference was significant.H₃J₂ treatment?mild water deficit in flowering stage and moderate water deficit in pod-forming period?showed the highest dry matter accumulation in pods,which was 107.23%higher than H₁J₁ treatment,and the difference was significant.?2?In the pod-forming period of 2017 and 2018,the net photosynthetic rate of H₃J₃ treatment was the highest,which was 136.67%and 99.36%higher than that of H₁J₁ treatment,respectively.The difference was significant.In the full-fruit period of 2017,H₃J₂ treatment?slight water deficit in flowering stage and moderate water deficit in pod-forming period?increased the net photosynthetic rate of peanut leaves by106.47%compared with H₁J₁treatment,and the difference was significant.?3?Regulated deficit irrigation during continuous growth period has significant effects on peanut yield and water use efficiency.The results of two years of experiments showed that H₃J₂ had the highest yield and H₁J₁ had the lowest yield.In 2017 and 2018,H₃J₂ treatment was higher than H₁J₁ treatment,and H₃J₃treatment was increased by 80.19%and 82.29%,12.14%and 14.99%,respectively.The difference was significant.It can be seen that the production of mild water deficit in continuous growth period is not the highest.In 2017 and 2018,H₂J₂ treatment had the highest water use efficiency,H₃J₃ treatment was the lowest,and H₂J₂ treatment increased H₃J₃ treatment by 44.16%and 45.03%,respectively.The difference was significant.In the past two years,H₂J₂ treated peanuts with higher yield and the highest water use efficiency,which is in line with the purpose of regulating water saving and stable production.?4?The water deficit caused the content of osmotic adjustment substances in peanut leaves to increase,and the treatment of severe water deficit?H₁?increased the proline content of peanut leaves to 12 times of CK?no loss?.Adaptability to drought,the content is 7 times that of CK.In the initial drought,the soluble protein content of severe water deficit,moderate water deficit?H₂?and mild water deficit?H₃?increased by35.64%,13.25%and 0.03%compared with the control.The initial water deficit reduced the net photosynthetic rate of peanut,and H₃ treatment decreased by 8.48%compared with CK.Water deficit increased the instantaneous water use efficiency of peanut.In the initial drought stage,the water use efficiency of moderate drought stress treatment increased by 14.20%compared with the control,and the water use efficiency of the drought again increased by 28.32%compared with the control.