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Documents from Gardening

A daily soil temperature model [946 kb]
Abstract: Soil temperature is a necessary component for estimating below-ground processes for continental and global carbon budgets; however, there are an insufficient number of climatic stations monitoring soil temperature. We used an 11-day running average of daily mean air temperature to estimate daily mean soil temperature at a depth of 10 cm using linear regression. This model was tested using data from 6 climate reg~onsa cross the United States. Frequency analyses for 17 of 19 data sets showed that the number of days which were w~thina k3.5OC range centered on the measured sol1 temperature va r~edfr om 77 to 96%. The values of R2 between observed and final predicted soil temperatures ranged from 0.85 to 0.96 with standard errors from 1.5 to 2.9´C for all 19 simulations. Changes of soil temperature under snow cover were smaller than those without snow cover. Soil temperature under vegetation cover was also simulated assuming the rate of soil warming under vegetation cover would be reduced with increasing leaf area index according to the Beer-Lambert Law. Annual soil respiration can be estimated from the predicted soil temperature with reasonable accuracy. Daily soil temperature may be predicted from daily air temperature once regional equations have been established, because weather stations in the United States can be generalized into a few regions and sites wthin each region may use the same equation. 
Reference: CLIMATE RESEARCH Vol. 2: 183-191.1993
Keywords: general

A daily soil temperature model based on air temperature and precipitation for continental applications [436 kb]
Abstract: Predictive models of optimum sweetpotato (Ipomoea batatas) harvest in relation to growing degree days (GDD) will benefit producers and researchers by ensuring maximum yields and high quality. A GDD system has not been previously characterized for sweetpotato grown in Louisiana. We used a data set of 116 planting dates and used a combination of minimum CV, linear regression (LR), and several algorithms in a data mining (DM) mode to identify candidate methods of estimating relationships between GDD and harvest dates. These DM algorithms included neural networks, support vector machine, multivariate adaptive regression splines, regression trees, and generalized linear models. 
Reference: CLIMATE RESEARCH Vol. 2: 183-191.1993
Keywords: general

Annual Biennial Seed Data [1663 kb]
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Keywords: general

Bedding Plant sowing guide [79 kb]
Abstract: Month by month sowing guide for bedding plants 
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Keywords: general

Bedding Plant sowing-guide [81 kb]
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Keywords: general

Chemigation [648 kb]
Abstract: Chemigation is the application of agricultural chemicals (fertilizer, fungicides, herbicides, nematodes, soil improvement remedies, growth regulators, sewage and manure water), in an effective and economic way, by means of an irrigation system. 
Reference: http://www.agis.agric.za/agric_engineering/pdf/IrrigationUserChemigation.pdf
Keywords: fertilizer, gardening

Climatic Requirements for Vegetables [23 kb]
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Keywords: general

Damping off of seedlings [137 kb]
Abstract: The single term used to describe underground, soil line, or crown rots of seedlings due to unknown causes is damping-off . The term actually covers several soil borne diseases of plants and seed borne fungi. 
Reference: http://tomclothier.hort.net/page13.html
Keywords: general

DegDays [822 kb]
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Keywords: general

Degree Day Concepts [343 kb]
Abstract: Temperature controls the developmental rate of many organisms. Plants and invertebrate animals, including insects and nematodes, require a certain amount of heat to develop from one point in their life cycles to another. This measure of accumulated heat is known as physiological time. Theoretically, physiological time provides a common reference for the development of organisms. The amount of heat required to complete a given organism´s development does not vary—the combination of temperature (between thresholds) and time will always be the same. Physiological time is often expressed and approximated in units called degree-days (°D). 
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Keywords: general

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