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This article in CS

  1. Vol. 29 No. 4, p. 1005-1011
     
    Received: Sept 21, 1988
    Published: July, 1989


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doi:10.2135/cropsci1989.0011183X002900040036x

Potato Leafhopper-Induced Injury on Growth and Development of Alfalfa

  1. Scott H. Hutchins  and
  2. Larry P>. Pedigo
  1. T he Dow Chemical Co., 11100 Bren Road West, Minnetonka, MN 55343
    D ep. of Entomology Insectary Building, Iowa State Univ., Ames, IA 50011

Abstract

Abstract

Yield of irrigated cotton (Gossypium hirsutum L.) increases as the interval between water applications is decreased, even if the total amount of water applied is unchanged. Experiments were undertaken to compare season-long water relations of high-frequency dripirrigated cotton (I- to 2-d intervals) to cotton irrigated at approximately 2-wk intervals. The crop was grown at two locations in central Arizona on a Mohall sandy loam (fine-loamy, mixed, hyperthermic Typic Haplargid) and an Avondale clay loam (fine-loamy, mixed, hyperthermic Typic Torrifluvent) soils. In 2-yr trials at each location, irrigation frequency had inconsistent effects on midday leaf water potential (ψw) during vegetative growth. When the crop developed a heavy fruit load, however, ψw of plants on the longer cycles was much lower than that of drip-irrigated plants, even after irrigation when ample soil moisture should have been available. Plant hydraulic conductances, estimated from regressions of single-leaf transpiration rate against ψw, were high in both treatments early in the season. Hydraulic conductance decreased greatly during fruiting in plants on long irrigation cycles but less so in drip-irrigated plants. Late in the season, after fruit maturation and daring plant regrowth, conductances were again high and similar in the two treatments. The results imply that during heavy fruiting, mild water stress associated with long irrigation cycles triggers deterioration of the root system that is very slow to be reversed. High-frequency drip irrigation, by preventing cyclical stress, apparently minimized this deterioration during fruit filling.

Contribution from the Inst. of food and Agric. Sci., Florida Agric. Exp. Stn. Journal Series no. 9190.

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Copyright © 1989. Crop Science Society of America, Inc.Copyright © 1989 by the Crop Science Society of America, Inc.