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Growth characteristics and water dem...

Gonzalez, Rico Antonio.

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Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system./
作者:	Gonzalez, Rico Antonio.
面頁冊數:	202 p.
附註:	Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2308.
Contained By:	Dissertation Abstracts International54-05B.
標題:	Biology, Plant Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9325503

Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system.
Gonzalez, Rico Antonio.

Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system. - 202 p.

Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2308.

Thesis (Ph.D.)--The Ohio State University, 1993.

A computer-controlled irrigation system was designed and developed to impose irrigation regimes based on the actual water-demand of container-grown plants. The control scheme was based on a simple control feedback loop using leachate detection of selected plants as the control parameter. This system was then used to test the hypothesis that reduced irrigation regimes might be used to promote increased root growth in certain species without reducing shoot growth.Subjects--Topical Terms:

1017865
Biology, Plant Physiology.

Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system.
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245 1 0 $a Growth characteristics and water demand of three Quercus species under reduced irrigation using a computer-controlled irrigation system.
300 $a 202 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2308.
500 $a Adviser: Daniel K. Struve.
502 $a Thesis (Ph.D.)--The Ohio State University, 1993.
520 $a A computer-controlled irrigation system was designed and developed to impose irrigation regimes based on the actual water-demand of container-grown plants. The control scheme was based on a simple control feedback loop using leachate detection of selected plants as the control parameter. This system was then used to test the hypothesis that reduced irrigation regimes might be used to promote increased root growth in certain species without reducing shoot growth.
520 $a In 1991 the computer-control system was designed and built and 250 red oak (Quercus rubra) seedlings grown under five different watering regimes. These regimes included a baseline irrigation, three reduced irrigations, 80, 60 and 40 percent of baseline, and a manual irrigation representing "standard nursery practice". The experimental designed was modified in 1992 to include Shumard oak (Q. shumardii) and black oak (Q. velutina) in addition to red oak. In this second growing season 1000 seedlings were grown under three different watering regimes including a baseline irrigation and two reduced irrigations, 80 and 60 percent of baseline.
520 $a The results from these experiments varied according to species type. The average root area of the red oak seedlings was significantly greater under reduced irrigation than seedlings grown under baseline irrigation and no differences in shoot growth were seen between treatments. The black oak seedlings showed significantly greater root mass, root area and root length under reduced irrigation compared to baseline irrigation. In addition the black oak seedlings had more leaves and greater leaf area under reduced irrigation. The Shumard oak seedlings showed no differences in any of the growth parameters measured between the different irrigation treatments.
520 $a Additionally, 4- to 10-times less water was used under baseline computer-controlled irrigation compared to manual irrigation. If the system were developed for commercial use in container nurseries, such reductions should result in reduced operating costs, leachate rates and fertilizer use. A reduction in these factors may be important to growers required to meet environmental regulations related to runoff.
590 $a School code: 0168.
650 4 $a Biology, Plant Physiology. $3 1017865
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Agriculture, Plant Culture. $3 1018669
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791 $a Ph.D.
792 $a 1993
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