Synopsis
In irrigated areas where a “plowsole” layer existed, a large percentage of plant roots were found to occupy the first foot of soil and especially the first 6 inches. The number and size distribution of roots per increment of soil depth gave a better comparison between different crops from the standpoint of soil physical properties than a comparison of root weights alone.
A thermoelectric method is described for the measurement of stream flow rates in the stems of plants. It has a definite advantage in that repeated measurements can be made on the same plant without damage to it. The method is quite simple and usually requires about 15 minutes for each measurement.
By subjecting cotton plants to different environmental conditions such as temperature, humidity, and wind velocity, it was found that the rate of water uptake and movement in the stem dropped from 114 cm./hr. to 76 cm./hr. when the wind velocity was changed from high to low. A temperature of approximately 99°F. and 20% relative humidity was maintained in both cases. With no wind movement but having a temperature of 82°F. and 62% relative humidity, the rate of water movement for the same plant was 38 cm./hr.
Present data show that this method is well adapted for indicating the effects of micro‐climate, soil moisture availability, and soil aeration upon the rate of water uptake and movement within intact plants. In addition, it has other uses which will be of interest to both the soil scientist and plant physiologist.
SYNOPSISMaximum transpiration rates for cotton plants were found to occur when relative humidities varied between 42 and 50%, temperatures from 95 to 100 F., and wind velocities between 1 and 4 miles per hour. Soil moisture tension appeared to control absorption and movement of water in plants.F ACTORS which cause a reduction in water absorption or transpiration will likewise affect the rate of water movement through .the plant ( 1, 4, 7). In order to evaluate the influence of such factors, a thermoelectric method has been developed . ( 2, 11) for studying the effe5:ts of 'Contribution of the 'Texas Agr. Exp. Sta., Weslaco, Tex. The
Synopsis
In a field experiment with grain sorghum, applications of 60 and 120 pounds per acre of nitrogen gave significant increases in both content and yield of protein in the grain and forage. Apparent nitrogen recovery was 83.2 and 89.6%, respectively, when 60 and 120 pounds of nitrogen per acre were applied.
Field experiments were conducted to determine the influence of TIBA and Gibberellin sprays on yield, growth characteristics and chemical composition of ‘California Black eye No. 5’ and ‘Purple Hull Pinkeye’ varieties of southern peas. Yield of peas was slightly increased on both varieties with the application of TIBA. Time of application as well as rate was a critical factor in producing maximum yields. Application of TIBA reduced plant size and concentrated maturity. The application of 50 ppm Gibberellin 5 days after application of 20 g per acre of TIBA further concentrated maturity and increased the desirability of peas for mechanical harvest. Iron concentrations in pea leaves were increased with application of TIBA.
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