负压灌溉下不同钾水平对小油菜生长的影响

doi:10.3864/j.issn.0578-1752.2017.04.009

Abstract

Abstract: 【Objective】Negative pressure irrigation is a new type of water supply technology. In this paper, the effects of five different potassium levels on growth, quality, nutrient uptake, utilization ratio and antioxidant enzyme activity of bok choy were compared. 【Method】In this experiment, five K fertilizer treatments including K0, K1, K1.5, K2 and K3, and 4 water supply treatments including 0, -5, -10, and -15 kPa were designed to study the effects of different potassium levels on bok choy growth. 【Result】(1) The soil moisture in clay loam under different pressures of water, respectively, was 28.52%, 22.45% and 18.13%, 15.4%, and when water pressures were between -5 and -10 kPa, the soil moisture was 18.13%-22.45%, which was suitable for crop growth. (2) The effect of different potassium levels on bok choy yield was significant, and that in K1.5 treatment was the highest, and increased by 16.9% compared with K1. The yield in K3 treatment was significantly decreased. (3) The effect of different potassium levels on the nitrate content of bok choy was significant, and potassium could significantly reduce nitrate content, nitrate content in K1.5 treatment decreased by 26.3% compared with that in K1. (4) Different potassium levels significantly affected the amount of nutrients uptake, nitrogen and potassium absorption of K1.5 were increased by 15.8% and 76.3% compared with that in K1. Phosphorus uptake in K1.5 treatment was less than that in K1. (5) K1.5 improved K utilization of crop by 173.32% compared with K1, and K1.5 significantly improved the agronomic efficiency of fertilizer, and increased by 83.9% compared with K1. (6) Compared to K1, K1.5 significantly increased the expression of the activities of POD, SOD, PPO, and PAL, but the flavonoid and total phenolic was not different with K1. 【Conclusion】 It was concluded that K1.5 was the best potassium application level. The optimum water supply pressure was -10--5 kpa kPa for clay loam.

Key words: negative pressure irrigation, bok choy, potassium, yield, quality

ZHAO XiuJuan, SONG YanYan, YUE XianLu, ZHANG ShuXiang, WU XuePing, LONG HuaiYu. Effect of Different Potassium Levels on the Growth of Bok Choy Under Negative Pressure[J].Scientia Agricultura Sinica, 2017, 50(4): 689-697.

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