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Effect of Potassium Rates on Assimilate and Potassium Distribution in Brassica chinensis(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年16
Page:
121-127
Research Field:
Publishing date:

Info

Title:
Effect of Potassium Rates on Assimilate and Potassium Distribution in Brassica chinensis
Author(s):
MIAO Qi1; 2; DING Yuanyuan1; JIANG Jie1; 3; DUAN Lizhen1; ZHOU Yi1; DONG Caixia3
(1.College of Resource and Environmental Science，Anhui Science and Technology University，Fengyang，Anhui 233100；2.College of Resource and Environmental Science，China Agricultural University，Beijing 100083；3.College of Resource and Environmental Science，Nanjing Agricultural University，Nanjing，Jiangsu 210095)
Keywords:
potassium; Brassica chinensis; assimilate; nutrition diagnosis
PACS:
-
DOI:
10.11937/bfyy.20164911
Abstract:
Two Brassica chinensis cultivars (‘Suzhouqing’ and ‘Aijiaohuang’) were used as materials，effect of potassium (K) rates (0.0，2.5，5.0，7.5，10.0 mmol?L-1) on assimilate and K distribution was studied in different parts of two Brassica chinensis cultivars by using sand culture method.The objective of the study were to reveal the relationship between symptom and diagnose of potassium nutrition，and to improve benefit-cost ratios with potassium efficient utilization technology.The results showed that biomass response of Brassica chinensis cultivars to K rate increased with the growing period.Assimilate distribution of Brassica chinensis cultivars ‘Suzhouqing’ was more sensitive to K rates than that of Brassica chinensis cultivars ‘Aijiaohuang’，since K rate for the maximum yield of ‘Aijiaohuang’ was higher than that of ‘Suzhouqing’.However，K rate for the maximum K content in different parts of ‘Suzhouqing’ was higher than that of ‘Aijiaohuang’.K content of the two Brassica chinensis cultivars followed the ascending order,petioles >leaves >roots.Moreover，both of K rate for the maximum K content in different parts of the two Brassica chinensis cultivars and the K distribution percentage followed the ascending order,leaves >petioles >roots，which suggested that sensitivity to K rate was significantly different among the different parts of the Brassica chinensis cultivars.Optimum K rate could enhance growth of the two Brassica chinensis cultivars by harmonizing assimilates distribution in different parts of the plants and maintaining the stability of the assimilates distribution ratio.Excessive K reduced K distribute to the roots，however，the reduction in ‘Suzhouqing’ was mainly due to the reduction in root K content，and in ‘Aijiaohuang’ was mainly due to the reduction in roots assimilate distribute，respectively，as compared with the normal K rate (5.0 mmol?L-1).K deficiency reduced assimilate and K distribute percentage in petiole and significantly increased the percentages in leaves and roots as well as the ratio of roots to shoot.Since increasing K rates increased both of assimilates and K distribution percentage in petiole of the two Brassica chinensis cultivars as compared with non-K supplied treatment.The increase in K distribution percentage was significantly higher than the increase in assimilate distribution percentage.It was showed that both of petiole K content and K distribution percentage are suitable to be used as K status diagnosis index.

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Last Update: 2017-08-31