面向智慧农业的分层土壤墒情监测仪的设计及应用

doi:10.11959/j.issn.2096-3750.2020.00188

Abstract

Abstract:

With the rapid development of the smart agriculture in China,the soil moisture monitoring has become particularly important.But there exist many problems in current monitoring methods,such as difficulties in layout and installation,electrode interference,and single monitoring depth.A soil moisture monitor suitable for the farmland was designed.For the hardware structure,a tube-type non-contact design scheme was adopted,and multiple modules were designed in order to realize the layered non-contact monitoring.For the software protocol,a control strategy of the multi-node access based on the Modbus protocol was proposed,which had the characteristics of high polling efficiency,data stability,and wide monitoring nodes.The data was transmitted to the cloud server through the message queuing telemetry transport (MQTT) protocol for the agricultural analysis and decision-making.The test in the vineyard area shows that the monitor can monitor the moisture content in the range of 0~100% and accuracy of ± 2.45%,which is of certain stability and practicality.

Key words: smart agriculture, soil moisture monitoring, layered non-contact, Modbus protocol, MQTT protocol

CLC Number:

TP212.9

Xiaoqiang ZHAO,Heng QUAN,Zhufeng YAN,Lujun WANG. Design and application of the layered soil moisture monitor for the smart agriculture[J]. Chinese Journal on Internet of Things, 2020, 4(4): 43-50.

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References 14

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所测物质	相对介电常数	所测物质	相对介电常数
水	80	花岗岩	7～9
空气	1	干沙土	2.5
乙醇	20～25	玄武岩	12
甲醇	37	瓷器	5～7
丙三醇	47	盐	4

测量方式（与人工烘干法相比）		土表下10 cm处	土表下20 cm处	土表下30 cm处	土表下40 cm处	平均相对误差
插针式传感器	均方差	2.98	2.68	2.94	2.84	3.33%
	相对误差	3.8%	3.1%	3.5%	2.9%
土壤墒情监测仪	均方差	1.40	2.34	2.43	2.54	2.45%
	相对误差	1.7%	2.6%	2.9%	2.6%

Design and application of the layered soil moisture monitor for the smart agriculture

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