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| Suitability of different rice varieties in saline-alkali land in northern Shaanxi |
| HE Zhenjia1,2, WANG Qilong1, LUO Lintao1*, DU Yichun1,2 |
| 1. Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Xi'an, Shaanxi 710075, China; 2. China Shaanxi High-standard Farmland Construction Group Co. Ltd., Yangling, Shaanxi 712100, China |
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Abstract The cultivation and screening of rice varieties suitable for cultivation in saline-alkali land in Dingbian County, northern Shaanxi is of great significance for the utilization of saline-alkali land and the improvement of the ecological environment. A field experiment was carried out in Yingpanliang Village, Duiziliang Town, Dingbian County. Four treatments T1, T2, T3 and T4 were set up, namely Longyou 619, Ningjing 28, Dongdao No. 4, and rice FL478. Well water was used as irrigation water sources to study the effects of different rice varieties on the physical and chemical properties, nutrients, soil ion changes, rice growth status and yield of saline-alkali soils. The results show that compared with that before rice planting, the soil pH value and total salt content of each treatment decreased to different degrees(P<0.05, P<0.01). After planting rice, each treatment promoted the reduction of soil clay content and the increase of silt content, while the sand content decreased. The soil organic matter content and total nitrogen content of each treatment increased to different degrees(P<0.01), but the contents of available phosphorus and available potassium decreased significantly(P<0.05). The organic matter content of soil tillage layer in treatment T1, T2, T3, and T4 increased by 219.87%, 398.34%, 218.91%, and 277.53%, respectively, and the total nitrogen content increased by 150.00%, 300.00%, 160.71%, and 29.23% respectively. The contents of Ca2+, Mg2+, Cl-, SO2-4 and HCO-3 in each treatment were decreased by 46.76%, 63.78%, 33.91%, 63.78% and 43.18%, respectively, when compared with the background value. Planting rice has a significant effect on soil desalination. The relationship between each treatment and rice plant height growth and number of ears per m2 was statistically significant(P<0.05). There was significant different in 100-grain mass quality and yield between treatment T1 and rice planted in saline-alkali land(P<0.01). Treatment T1 improved by 4.96%, 42.78% and 161.64% compared with T2, T3 and T4,respectively. Longyou 619 and Ningjing 28 have higher rice yields and are more suitable rice varieties for planting in saline-alkali land in northern Shaanxi, and can be promoted in northern Shaanxi.
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Received: 22 June 2020
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