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  • Author or Editor: Richard L. Snyder x
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Almond (Prunus dulcis Mill.) cultivars vary in tolerance to cold with flowers at pink bud more tolerant than at full bloom or than small nuts. Branch samples 60 cm long with 30-100 blossoms or nuts were cut, sprayed with water, and artifically frozen. Subsamples were removed after exposure to 4 to 6 successively lower temperatures for 30 minutes. After 48 hours of ambient temperatures, flowers or small nuts were sectioned and examined for visual evidence of injury. Of the early cultivars, `Peerless', is most sensitive at full bloom and `Sonora' is most hardy. `Sonora' is especially hardy at pink bud. `NePlus Ultra' is intermediate. Of the mid-blooming cultivars, `Carmel' is most sensitive to cold while `Nonpareil' is most tolerant. `Price' is intermediate. The late blooming cultivar, 'Mission' is most sensitive while 'Padre' and 'Butte' appear similar. This study compared several popular new cultivars to older industry standards.

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The influence of 3 watering frequencies and 5 volumes of medium on a spring crop of greenhouse tomatoes (Lycopersicon esculentum Mill.) was evaluated. Watering frequencies of 1, 4, or 8 times/day had no effect on leaf area, total flower and fruit numbers per plant, percentage of fruit set, leaf number between clusters, or percentage of water in leaves, shoots, or fruit. Plants watered once per day had higher shoot fresh and dry weights than those watered 4 or 8 times per day. Plants grown in 14 liter/plant bags had greater leaf relative water content when measured at noon or midmorning, than plants grown in 7 or 35 liter/plant treatments. Percentage of water and percentage of roots in the medium increased from the upper to lower portion of the bags. Plants grown in the 7 liter/plant bag produced lower yield, smaller fruit, and poorer quality fruit (due mostly to blossom-end rot) than plants from the 14, 21, and 35 liter/plant medium volume treatments.

Open Access

Many citrus growers are hesitant to plant cover crops, particularly perennial types, because of possible increased frost hazard. To quantify the increased risk, temperature relations over a 3-year period were compared between areas in a `Valencia' orange orchard with and without a partial perennial cover crop. The partial perennial cover crop consisted of a mowed perennial planting along the double drip line hoses, and an annually fall-replanted unirrigated strip of groundcover in the middle between the tree rows. This partial perennial cover crop increased the frost hazard compared to uncultivated bare ground even when wind machines were operating.

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