Cone index and root growth in surface and subsurface microirrigated hardpan soil |
| |
| Institution: | 1. Engineering Research Center for Structured Organic Particulate Systems (C-SOPS), Department of Chemistry, University of Puerto Rico, Mayaguez Campus, Mayaguez, PR 00681, USA;2. Engineering Research Center for Structured Organic Particulate Systems (C-SOPS), Department of Chemical Engineering, University of Puerto Rico, Mayaguez Campus, Mayaguez, PR 00681, USA;1. Genética Molecular-Laboratorio Medicina, HUCA, Oviedo, Spain;2. Nefrología, HUCA, Oviedo, Spain;3. Centro de Salud El Cristo, Oviedo, Asturias, Spain;4. Cardiología, HUCA, Oviedo, Spain;5. Dermatología, HUCA, Oviedo, Spain;6. Inmunología, HUCA, Oviedo, Spain;7. Universidad de Oviedo, Oviedo, Spain;8. RED INVESTIGACION RENAL (REDINREN), Madrid, Spain;9. Instituto de Investigación Sanitaria del Principado de Asturias-ISPA, Oviedo, Spain;1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;1. Department of Crop Science, School of Agriculture, College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana;2. Department of Environmental Science, School of Biological Sciences, College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana;3. West Africa Centre for Crop Improvement, College of Basic and Applied Sciences (CBAS), University of Ghana (UG), Legon, Accra, Ghana;4. Cocoa Research Institute of Ghana (CRIG), P. O. Box 8 New Tafo-Akim. Eastern Region, Ghana;1. Council for Agricultural Research and Economics, Research Centre for Animal Production and Aquaculture (CREA-ZA), 85051 Bella Muro (Potenza), Italy;2. School of Agricultural, Forest, Food and Environmental Sciences – SAFE, University of Basilicata, Potenza, Italy;3. Department of Agricultural Sciences, University of Naples Federico II, Portici (Naples), Italy |
| |
| Abstract: | Restricted root growth caused by subsurface hardpans and low water holding capacity reduces crop yields in many United States southeastern Coastal Plain soils. With intensive irrigation it is possible to obtain suitable yields without deep tillage. The objective of this study was to find differences of root growth and cone indices between surface and subsurface applied sources of irrigation water. We measured root growth and cone index in intensively managed irrigation plots of green beans (Phaseolus vulgaris L.) in 1988 and 1989. Microirrigation tubes were placed on the surface or in the subsurface — buried at a depth of approximately 0.25 m — and irrigated either continuously or with intermittent pulses of water. Mean profile cone indices for the surface tube placement were significantly lower than for the subsurface tube placement. Mean profile cone indices for the continuous irrigation treatment were significant lower than for the intermittent irrigation treatment. However, no one treatment significantly reduced the cone indices within the hardpan. Total root count was significantly greater for the subsurface tube placement with increased root growth below the 0.1-m depth. There was a high density of roots next to the subsurface tube that would have been effective in uptake of water from the microirrigation tube. However, yield was significantly greater for the surface tube placement. For all treatments, the largest concentration of root growth occurred in the top 0.2 m of the soil within the row. We expected this for the surface irrigation treatment. However, we also measured this for the subsurface treatment, probably because of high rainfall and upwelling of water from the subsurface micro-irrigation tube. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
