Long-term Continuous and Rotation Cropping: Effect on Photosynthetic Characteristics, Roots Configuration and Yield of Dry-land Millet

doi:10.11923/j.issn.2095-4050.cjas18090004

Abstract

Abstract: This study aims to provide theoretical and technical support for overcoming the continuous cropping obstacles of millet and achieving sustainable production of farmland in dryland areas. Comparing annual single- order rotations cropping with long- term continuous cropping, the effects on the photosynthetic characteristics, root configuration and yield of dry-land millet are studied. The results show that the rotation cropping increases the yield, leaf chlorophyll content and net photosynthetic rate by 22.02%, 20.58% and 15.34% , respectively, which are significantly higher than that of the continuous cropping. Compared with continuous cropping, the rotation cropping significantly improves the growth of root with different diameter ranges, it obviously increases the specific root length (SRL), specific root surface area (SRA), root volume and root tip density in different diameter ranges (0.5 ≤mmdiameter≤1.0 mm: every index increases by 92.17%, 62.94% , 72.73% , 75.08% , respectively, diameter ≥1.0 mm: every index increases by 44.09% , 86.32% , 86.37% , 181.71% ). It is concluded that the rotation cropping could enhance the photosynthetic index parameters and root index parameters, alleviate the obstacle of continuous cropping and thus increase the millet yield.

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