Method for improving yield of sweet potatoes in medium and slight saline-alkali soil

Abstract

The invention relates to a method for improving the yield of sweet potatoes in the medium and slight saline-alkali soil. The method is characterized in that the width of the top face of each ridge of the sweet potatoes is 55-65cm, the width of the bottom of each ridge is 90-100cm, the distance between the ridges is 1.2m, the sweet potato variety with the seedling stage which can bear 85mmol / L sodium chloride is arranged on the top face of each ridge in a double-row staggered cuttage mode, the planting distance in each row is 33cm, the cuttage quantity is 3600-3800 plants per mu, and the total quantity of rainfall in the planting season of the sweet potatoes is 450-600mm.

Description

technical field [0001] The invention relates to a sweet potato cultivation technology, in particular to a method for increasing the yield of sweet potatoes on medium and mild saline-alkali land. Background technique [0002] my country's coastal saline-alkali tidal flat area is about 45 million mu, of which Jiangsu accounts for more than 1 / 4. Different from the gradual decrease of cultivated land area, the coastal tidal flat area is gradually expanding, which is an important reserve land resource (Jin Wenhui, Yang Jinsong, Wang Xiangping. Tidal flat soil organic carbon Correlation analysis between spatial distribution and reclamation years. Chinese Journal of Agricultural Engineering, 2013,29(5):89-92). Saline-alkali soil has a high content of basic ions and pH value. Coastal saline-alkali soil generally contains more sodium ions and chloride ions, and the pH value is generally around 8.5. The osmotic pressure of the soil solution is high, which affects the growth of crops. ...

AI Technical Summary

Problems solved by technology

The life cycle can be successfully completed on medium and mild saline-alkali soils with a soil salinity lower than 3‰, but sweet potatoes are more sensitive to salinity and moisture, and high sodium and chloride ions in the root zone during the growth period of sweet potatoes often lead to premature senescence of sweet potatoes. The chlorophyll of sweet potato leaves is degraded into anthocyanins, the yield of root tubers is reduced, the economic yield and quality are reduced; sweet potatoes have high requirements for water, and after the sweet potatoes are ridged, if the water content is higher than 80% of the field water capacity, there will be a tendency to grow excessively; The soil moisture content in the mid-term should be lower, preferably 50% to 60%, which is beneficial to the control of excessive growth in the mid-term; and the range of soil moisture in the late growth period can be larger, but it should not be greater than 80% or lower than 45%, otherwise it will cause damage. Reduce fresh potato yield (GOMES F and CARR M K V. Effects of water availability and vine harvesting frequency on the productivity of sweet potato in southern Mozambique. Ш. Crop yield / water- use response functions [J]. Experimental Agriculture, 2003, 39 : 409 - 421.), therefore, coordination of salinity and water is an important basis for high yield of sweet potato on medium and low saline-alkali soil

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