Efficient irrigation; inefficient communication; flawed recommendations

Perry, Chris

doi:10.1002/ird.323

Cited by 305 publications

(122 citation statements)

References 10 publications

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“…However, Irrigation performance indices that take into account the productive or economic results of the water devoted to irrigation are increasingly gaining interest. This is the case of the water productivity lindex proposed by Perry (2007) The irrigation water productivity can be expressed either in terms of yield (kg/m 3 ) or in terms of economic returns (€/m 3 ) (Malano et al 2004;Pande et al 2012;Yihun et al 2013;Martínez and Reca 2014).…”

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confidence: 99%

Water Productivity in a Mediterranean Semi-Arid Greenhouse District

Sánchez

Reca

Martínez

2015

Water Resour Manage

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An irrigation performance analysis has been carried out in a horticultural greenhouse area located in the BCampo de Níjar^(Southern Spain) in order to assess its irrigation productivity. Irrigation water productivity indicators were calculated for a wide sample of crops over the course of two different study periods. These productivity indices were similar in average to those reported in other nearby greenhouse irrigation districts although their variability was very high. The overall productivity ratio (CYR) was 73.9 %. The low values for CYR were expected as irrigation water in this area has high salinity levels and low irrigation leaching fractions were applied. The influence of type of crop, greenhouse technology and agricultural season in the CYR values was analyzed. None of these factors had a statistically significant influence. A multivariate regression analysis was performed to model the crop yield as a function of several quantitative variables. The results showed that the most significant variable was the relative irrigation supply (RIS). Other variables that had an influence of the productivity were the length of the growing cycle in the case of tomato and the number of greenhouses per farm in the case of watermelon. Results of this work are useful as they highlight the weaknesses of the system and suggest possible measures in order to improve its productivity and sustainability.

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confidence: 99%

Water Productivity in a Mediterranean Semi-Arid Greenhouse District

Sánchez

Reca

Martínez

2015

Water Resour Manage

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“…Considering these differences, the water and salt management practices at the two case studies were discussed. According to the mean water use efficiency (ET/R+I) (Perry, 2007;Heydari, 2014), less water was applied than used by the crop with objective scheduling during the winter (1.17) and summer (1.19) seasons compared to subjective scheduling (0.88 during winter and 0.99 during summer). This was possible because rainfall and the groundwater table were utilized better as sources of water for crop water requirements.…”

Section: Discussionmentioning

confidence: 99%

Water and salt balances of two shallow groundwater cropping systems using subjective and objective irrigation scheduling

Barnard

Rensburg

Bennie

et al. 2017

WSA

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Evidence suggests that, in general, subjective rather than objective irrigation scheduling decisions are adopted by farmers. Irrigators have 'calibrated' themselves with years of experience to irrigate subjectively according to perceived crop water requirements. This study aimed to determine the associated benefits of objective versus subjective scheduling of two shallow groundwater cropping systems. Weekly measurements included rainfall and irrigation amounts, soil water content, groundwater table depth, artificial drainage volumes, and electrical conductivity of irrigation water, groundwater and drainage water. Simulations of evaporation and transpiration were done with the SWAMP model. Based on soil water and salinity status, matric and osmotic stress during the four cropping seasons is considered unlikely. When rainfall-plusirrigation was compared to evapotranspiration, objective scheduling resulted in an under-supply of 15%, and rainfall and shallow groundwater served as supplementary water sources. Subjective scheduling did not use rainfall efficiently as a source of water and resulted in an over-supply of 10%. Approximately 50% less salt was leached with objective compared to subjective irrigation scheduling. Under shallow groundwater conditions, irrigating subjectively according to crop water requirement results in excessive irrigation, salt addition and leaching compared to objective scheduling. Farmers can address some of the environmental problems associated with irrigation by adopting objective scheduling and reducing the leaching fraction (< 0.15) of shallow groundwater cropping systems.

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“…According to Ostrom report [7], there is an almost threefold increase in the total area of irrigated agriculture during the past century. Perry's study [8] also indicated that 20 % of total cropland (irrigated agriculture) produces more than 40 % of the world's total agricultural output. Therefore, expansion of irrigated agricultural areas is essential in nation-building processes [9].…”

Section: Introductionmentioning

confidence: 99%

A wireless rainwater collecting, filtering, and storing system using a cell-phone

Cheng

Chiu

2018

MATEC Web Conf.

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Abstract. Because of the greenhouse effect, global climate considerably changes and will worsen the water supply situations in future. Also, as can be seen in traditional reservoir, the crisis of water lacking will exacerbate due to the reservoir sedimentation. In order to widen the storage of water resources, a design of portable rain-collecting system used for irritation and daily use for people is presented. To facilitate the monitoring and manipulating, a rainwater collecting and storing system with green energy/automation /monitoring/control function is established. Considering the electricity shortage in remote island/mountain regions, two kinds of green energy generators (wind electrical generator and solar-board electrical device) are built and linked with the system. Here, a rain detector installed onto the roof can actuate the rainwater collecting board to raise and to collect water when raining event occurs. For the purpose of water purity, water filter is also set at the entrance of the water tank. In order to efficiently store/use the rainwater, several water storage tanks in conjunction with ecological pool are preset and adjusted via the water level gauge sensors and the pipe's solenoid valve. To meet the weather-proof ability, PLC is adopted as the controller. Moreover, a human-machineinterface is login on the internet and remotely communicated with the cell phone.Consequently, a prototype of the cell-phone base automatic rainwater collecting and storing system is established.

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Efficient irrigation; inefficient communication; flawed recommendations

Cited by 305 publications

References 10 publications

Water Productivity in a Mediterranean Semi-Arid Greenhouse District

Water Productivity in a Mediterranean Semi-Arid Greenhouse District

Water and salt balances of two shallow groundwater cropping systems using subjective and objective irrigation scheduling

A wireless rainwater collecting, filtering, and storing system using a cell-phone

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