Effects of irrigation frequency and water table depths on root growth and yield of tomato in a tropical soil
Abstract The effects of irrigation frequency and water table depths on tomato ( Lycopersicon esculentum , Mill, cv. Ife 1) root growth and fruit yield on a tropical soil were investigated. Tomato was grown at two water table depths (deep > 100 cm, and shallow Root length density, rooting depth, and fruit yield were generally higher at the deep than at the shallow water table location. At the deep water table location, the one-week irrigation frequency gave significantly higher root length density and fruit yield than the other irrigation frequencies. At the shallow water table location the two-week irrigation frequency gave higher fruit yield than the one- and three-week irrigation frequencies. There was a significant positive correlation between root length density and fruit yield.
Evaluation of a computer model to simulate water table response to subirrigation
(3) and Salvadore Jose Locascio(4) Abstract - The objective of this work was to evaluate the water flow computer model, WATABLE, using experimental field observations on water table management plots from a site located near Hastings, FL, USA. The experimental field had scale drainage systems with provisions for subirrigation with buried microirrigation and conventional seepage irrigation systems. Potato (Solanum tuberosum L.) growing seasons from years 1996 and 1997 were used to simulate the hydrology of the area. Water table levels, precipitation, irrigation and runoff volumes were continuously monitored. The model simulated the water movement from a buried microirrigation line source and the response of the water table to irrigation, precipitation, evapotranspiration, and deep percolation. The model was calibrated and verified by comparing simulated results with experimental field observations. The model performed very well in simulating seasonal runoff, irrigation volumes, and water table levels during crop growth. The two-dimensional model can be used to investigate different irrigation strategies involving water table management control. Applications of the model include optimization of the water table depth for each growth stage, and duration, frequency, and rate of irrigation.
First Insights into the Draft Genome Sequence of the Endophyte Paenibacillus amylolyticus Strain GM1FR, Isolated from Festuca rubra L.
ABSTRACT Paenibacillus amylolyticus strain GM1FR is an endophyte isolated from aerial plant tissues of Festuca rubra L. Here, we report the draft genome sequence (7.3 Mb) of GM1FR containing 6,241 protein-coding genes, some of which are potentially involved in plant growth promotion and biocontrol.