| At present,Xinjiang drip irrigation wheat uses "1 pipe and 4 rows" as the main drip irrigation belt deployment method.The "1 pipe and 6 rows" and "1 pipe and 8 rows" tube layout methods have different varieties and grain yields between different rows.In order to explore the differences in wheat agronomic traits and yields among different varieties and rows and their influencing factors under the drip irrigation mode of “1 pipe,6 rows,1 pipe,8 rows”,a random block design was adopted,with 1 pipe and 4 rows(TR4,with Three types of drip irrigation belts are configured with a pitch of 60 cm,one pipe with 6 rows(TR6,with a spacing of 90cm),and one pipe with 8 rows(TR8,with a spacing of 120cm).The wheat is machined with equal row spacing and the row spacing is 15 cm.To study the dry matter accumulation and distribution,plant nitrogen accumulation and distribution,photosynthetic characteristics,soil volume between the first(R1),second(R2),third(R3)and fourth(R4)rows near the drip irrigation belt The effects of water content,water use efficiency and yield traits are intended to provide a theoretical basis for the expansion of pipe drip irrigation wheat row ratio and further reduce costs and increase efficiency.The main findings are as follows:(1)The effect of expanding the pipe-row ratio on the growth and yield of spring wheatWith the increase of the drip irrigation zone spacing,the leaf area,photosynthetic parameters,dry matter accumulation,and plant nitrogen content of each treatment were the highest in the TR4 drip irrigation mode.In the case of the same irrigation volume,the larger the distance between the drip irrigation belts,the smaller the water consumption,the lower the water use efficiency and the irrigation water use efficiency,and the lower the yield.The decrease in inter-row output of Xinchun44 was smaller than that of Xinchun 22.The yield of Xinchun 22 was lower than that of Xinchun 44,and the dry matter accumulation of Xinchun 22 was also lower than that of Xinchun 44.Through the comparison of economic benefits,the economic benefits of each treatment in 2018 and 2019 are represented as TR4>TR6>TR8,and the cost between each treatment is represented as TR8<TR6<TR4.Although TR8 greatly saves costs,the ultimate economic benefit is the lowest.During the grain formation period,the TR6 drip irrigation mode has the highest transfer rate after flowering and the highest contribution rate to the grain,and the TR6 nitrogen accumulation is higher than the TR4 and TR8 nitrogen accumulation.At the same time,the TR6 drip irrigation mode is in the flowering period-the mature period.The accumulation of nitrogen is also the highest in the stage.Therefore,the TR6 drip irrigation mode is the best drip irrigation method in terms of nitrogen accumulation,transportation and distribution.(2)The effect of expanding the tube row ratio on spring wheat growth and yield formationUnder the expansion of the pipe-row ratio,the leaf area per plant,photosynthetic parameters,dry matter accumulation,and plant nitrogen content all showed that the near row was higher than the far row.Water use efficiency and irrigation water use efficiency are also higher than those in the near trip,and the above laws are consistent with the yield laws.From the yield contribution rate among the rows,it can be concluded that the contribution rate of wheat output in the long-distance row is lower than that in the nearby row.Therefore,increasing the output of long-distance wheat and reducing the decline in the yield of long-distance wheat are of great significance to the promotion of expanding the ratio of management to rows.In summary,Xinchun 44 is more suitable for expanding the pipe-row ratio.Although the TR6 drip irrigation model is better in terms of nitrogen accumulation,the yield and economic benefits are still lower than the TR4 drip irrigation model. |
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