Influence of sprinkler irrigation droplet diameter, application intensity and specific power on flower damage

doi:10.15302/J-FASE-2017145

Front. Agr. Sci. Eng.

2017, Vol. 4

Issue (2) : 165-171 https://doi.org/10.15302/J-FASE-2017145

RESEARCH ARTICLE

Influence of sprinkler irrigation droplet diameter, application intensity and specific power on flower damage

Yisheng ZHANG¹, Delan ZHU^1,²(

)

¹. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
². Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling 712100, China

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Abstract

To determine the main parameters of droplet strike damage and avoid flower injury due to the unsuitable practices during sprinkler irrigation, an indoor experiment of irrigation droplet impact on cyclamen was conducted. The influences of different parameters such as droplet diameter, application intensity, specific power on flower strike damage was analyzed using Image Pro-Plus software to compute strike damage area and define damage level by sense-analysis. The results showed that a damage area of <1% represents a safe irrigation level, 1%–3% slight damage level, 3%–6% moderate damage level, and>6% heavy damage level. Equations of application intensity, specific power with sprinkler irrigation time and flower injury ratio were regressed against parameters which cause impact damages. The results indicated that specific power has a significant correlation with injury, and flower damage area increased as the increasing of the value of specific power for the same irrigation time. Application intensity was also correlated with injury when the droplet diameter was larger than 1 mm. When the duration of sprinkler irrigation was 1, 5 and 10 min, the threshold of impinging damage of application intensity was 25.30, 5.01 and 1.64 mm·h⁻¹ and the specific power was 0.467×10⁻³, 9.340×10⁻³ and 3.110×10⁻³ W·m⁻². These results provide a reference for determining the suitable values of sprinkler properties in operation design.

Keywords application intensity damage floriculture flowers specific power sprinkler irrigation

Corresponding Author(s): Delan ZHU

Just Accepted Date: 19 April 2017 Online First Date: 11 May 2017 Issue Date: 07 June 2017

Cite this article:

Yisheng ZHANG,Delan ZHU. Influence of sprinkler irrigation droplet diameter, application intensity and specific power on flower damage[J]. Front. Agr. Sci. Eng. , 2017, 4(2): 165-171.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2017145
https://academic.hep.com.cn/fase/EN/Y2017/V4/I2/165

Tab.1 Hydraulic characteristics of Nelson D3000 type sprinkler head

Fig.1 Changes in flower morphology before (a) and after (b) sprinkler irrigation

Fig.2 Different proportions of strike damage to petals. (a) 0.55%; (b) 1.02%; (c) 1.93%; (d) 2.87%; (e) 4.13%; (f) 5.96%; (g) 9.66%.

Fig.3 Relationship between petal damage proportion and droplet diameter

Fig.4 Relationship between proportions of petal damage and application intensity

Fig.5 Relationship between proportion of petal damage and specific power

Tab.2 Coefficients of application intensity and specific power

Fig.6 Relationship between calculated and measured proportion of petal damage

Tab.3 Threshold value of irrigation intensity with various damage levels at different irrigation time

Tab.4 Threshold value of specific power at various damage levels at different irrigation time

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