The Determination of Selected Chemical Characteristics of Soil Which Affect the Growth and Composition of Plants

Phenodynamic Analyses of Two First-Year Old Fields

“…Soil texture was determined using the procedure described by Bouyoucos (1936) and Piper (1942): Determinations were also made of total phosphorus (Shelton and Harper, 1941), organic carbon content reported as Walkley Black values (Piper, 1942), total nitrogen (Macro-Kjeldahl Method modified from Noggle and Wynd, 1941), nitrate-nitrogen (Mahendrappa, 1969), and total base exchange capacity (Noggle and Wynd, 1941). These were weighed, dried in an oven at 110 C for 24 hr with the lid removed, and reweighed to determine percent soil moisture.…”

“…Soil reaction was determined by the glass electrode method, using 50 ml of distilled water per 109 of air-dried soil. Soil texture was determined using the procedure described by Bouyoucos (1936) and Piper (1942): Determinations were also made of total phosphorus (Shelton and Harper, 1941), organic carbon content reported as Walkley Black values (Piper, 1942), total nitrogen (Macro-Kjeldahl Method modified from Noggle and Wynd, 1941), nitrate-nitrogen (Mahendrappa, 1969), and total base exchange capacity (Noggle and Wynd, 1941). Duplicate tests were run for each sample.…”

Phenotypic variation of cassava root traits and their responses to drought

“…Each pot contained 5 kg of organic growth media containing rain tree leaf soil and bamboo soil (1 : 1 volume ratio). Water‐holding capacity was measured and processed as described by Noggle and Wynd (), and it was calculated as the percentage from the ratio of mass of the water in saturated soil to the mass of the saturated soil. The soil in each pot was saturated with water and drained for a day to evaluate percentage of soil water content that was determined by gravimetric measurement (Evett, ).…”

INFLUENCE OF NUTRITIONAL FACTORS ON CORRELATION BETWEEN VITAMIN C CONCENTRATION AND GROWTH OF CEREALS1

“…The chemical properties of the soil were determined by the methods described by Noggle and Wynd (1941), Wynd and Romig (1943), and Wynd and Noggle (1943). 'The expenses incurred by the present study were borne in part by a grant from the Cerophyll Laboratories, Inc., Kansas City, Missouri.…”