Agronomy and Crop Sciences Commons^™

How Potassium Affects Emergence Of Five Supersweet Corn (Zea Mays L. Var. Rugosa) Cultivars With Low Temperatures, Nombasa Tsengwa

Masters Theses

Supersweet types of sweet corn (Zea mays L. var rugosa) are sensitive to low temperature during emergence and thus have difficulty in establishing stands in early spring. This study investigated how banded potash affected establishment of five supersweet cultivars of sweet corn in fields and growth chambers.

In the field, sweet corn cultivars were planted near Urbana, Il on April 18 and July 22, 1991 with three levels of potash (0, 45 and 90 kg/ha) banded at planting. Several parameters of growth and development were measured approximately 2, 4 and 6 weeks after planting. No significant effect of potash was …

Mechanisms Controlling Tolerance Of Lettuce Seed To High Temperatures At Germination And Emergence, Margaret A. Mnichowicz

Masters Theses

Lettuce (Lactuca sativa L.) seed germination is inhibited when temperatures are higher than 25-30 C. The extent of this thermodormancy is affected by both genetic and environmental factors. Lettuce seed of four seedlots of "Empire" produced in the summers and winters of two years were sown in the field in late summer and early fall at Yuma, AZ to determine stand establishment with high soil temperatures. The seedlots produced in the summer had higher percent field emergence than those produced in the winter. Also, seed of these four seedlots were germinated in petri dishes in a growth chamber at 20, …