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Timothy K. Hartz and Thomas G. Bottoms

Processing tomato is an important crop in California, where more than 100,000 ha are produced annually ( Hartz et al., 2008 ). In recent years, drip irrigation has revolutionized production and increased fruit yield expectations; some California

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Wilton P. Cook and Douglas C. Sanders

The effects of fertilizer placement and soil moisture level on soil N movement, uptake, and use by tomato plants (Lycopersicon esculentum Mill) grown with drip irrigation and plastic mulch were evaluated at two locations on two types of sandy soils. Broadcast or band fertilizer placement had no effect on fruit size, fruit number, or total yield. Fruit size was increased at one location, and the incidence of blossom-end rot was decreased by increased frequency of irrigation. Nitrate-N distribution within the bed was not affected by initial N placement. In the soil with a rapid infiltration rate, NO3-N levels in the center of the bed were always low, with highest concentration observed in the areas of the bed most distant from the drip tube. In the soil with the slower infiltration rate, NO3-N concentrations were more uniform throughout the bed, with highest concentrations in the bed center: Increasing soil moisture levels (–20 kPa vs. –30 kPa) resulted in increased leaching and reduced NO3-N concentration throughout the bed. Foliage N concentration was not affected by N placement, but decreased seasonally. Total N uptake by the above-ground portion of the plants was not affected by fertilizer placement or soil moisture level.

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Shixin Deng, Qun Yin, Shanshan Zhang, Kankan Shi, Zhongkui Jia, and Luyi Ma

twice a week with 81/h tricklers rather than by irrigating every day or once a week with 41/h tricklers. Zhao et al. (2012) reported that surface drip irrigation caused the roots of Elaeagnus angustifolia to be distributed in the topsoil and that the

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Quan Liu, Yan Lan, Feng Tan, Yunbiao Tu, Yingying Sun, Gajue Yougu, Zeshen Yang, Chunbang Ding, and Tian Li

), drip irrigation (DI)]. Field sampling and measurements. Four branches with flower buds and new apical shoots from the four directions (east, south, west, and north) in each sampling tree were labeled at the end of March for field survey. The shoot

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Sanjit K. Deb, Parmodh Sharma, Manoj K. Shukla, Theodore W. Sammis, and Jamshid Ashigh

to salt stress under higher irrigation water salinity treatment levels. The objective of this study was to compare salinity responses and salinity-related suppression of budbreak of drip-irrigated pecan seedlings of rootstock ‘Riverside’ grafted with

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Oleg Daugovish, Mark Bolda, Sukhwinder Kaur, Maren J. Mochizuki, Daniel Marcum, and Lynn Epstein

germination and infection, we postulated that drip irrigation in the nursery would reduce the impact of C. acutatum in fruiting fields. The objective of this study was to evaluate the impact of irrigation method and the presence of pathogen pressure in a

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Donavon Sonnenberg, Patrick A. Ndakidemi, Ambrose Okem, and Charles Laubscher

( Chartzoulakis and Drosos, 1995 ; Sedibe, 2003 ). Drip irrigation is a localized technology that supplies water and dissolved nutrients directly to the roots of crops. This improves photosynthetic capacity of plants, maximizing yield, minimizing water usage, and

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Timothy Coolong

Subsurface drip irrigation has been increasingly employed for the production of specific vegetables, such as onion ( Allium cepa ) and processing tomato ( Solanum lycopersicum ) ( Ayars et al., 2015 ; Enciso et al., 2007 ; Leskovar et al., 2004

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Brent Rowell and Mar Lar Soe

Commercial horticultural crop growers in the United States, Europe, Australia, China, Korea, Brazil, Mexico, South Africa, and the Middle East enjoy the benefits of drip irrigation, which have been described in numerous research and extension

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T.K. Hartz

Many factors influence appropriate drip irrigation management, including system design, soil characteristics, crop and growth stage, and environmental conditions. The influences of these factors can be integrated into a practical, efficient scheduling system that determines quantity and timing of drip irrigation. This system combines direct soil moisture measurement with a water budget approach using evapotranspiration estimates and crop coefficients.