Effects of Drilling Density on Plough Layer Improvement and Rice Yield in Saline-sodic Soil
Received date: 2022-08-02
Online published: 2022-11-17
Soda saline-alkali soil is an important reserve cultivated land resource in China, but its soil physical and chemical properties are poor and the yield of planted crops is low. The improvement and rational utilization of soda saline-alkali land has a great significance for the development of regional agriculture, but the improvement cycle is long, difficult and costly. In this study, through field experiments, five drilling densities were set up to analyze the effects of different drilling densities on soil aggregate structure, pH value, soil salinity and rice yield under the condition of filling amendments. The results showed that, compared with the control without drilling, the drilling treatment increased the content of soil water-stable aggregates, decreased the pH and salinity in plough layer soil, and increased the effective panicle number and seed setting rate of rice, thereby increased rice yield. With the increase of drilling density, the plough layer soil improvement was improved. Compared with the control without drilling, when the drilling density reached 15 holes/m2, the content of water stable aggregates in plough layer soil and rice yield increased by 26.22% and 72.57%, pH value and soil salinity decreased by 4.75% and 10.16%, respectively. Continuing to increase the drilling density, the rice yield decreased, but the difference was not significant with the hole punching density treatment of 15 holes/m2. Comprehensive production practice and operability, drilling density of 15 holes/m2 or drilling area of 0.12 m2 per 1.0 m2 can be used as a reasonable drilling plan for improving moderate and severe soda saline-alkali paddy fields. The results provide a theoretical basis for the innovation of soda saline-alkali paddy field improvement technology.
Key words： soda saline-sodic land; drilling density; rice; yield; soil improvement
LI Shuaizhi, HOU Ligang, LIU Liang, MA Wei, LIU Xiaoliang, LIN Zhe . Effects of Drilling Density on Plough Layer Improvement and Rice Yield in Saline-sodic Soil[J]. China Rice, 2022 , 28(6) : 59 -62 . DOI: 10.3969/j.issn.1006-8082.2022.06.012
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