Off-campus UNL users: To download campus access dissertations, please use the following link to log into our proxy server with your NU ID and password. When you are done browsing please remember to return to this page and log out.
Non-UNL users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
INFLUENCE OF IRRIGATION BY GROWTH STAGE AND PERCENT OF FULL IRRIGATION ON YIELD, YIELD COMPONENTS AND PLANT MORPHOLOGICAL CHARACTERISTICS UPON SOYBEANS (GLYCINE MAX (L.) MERRILL) (GRADIENT)
Abstract
Proper irrigation management of soybeans requires an understanding of the responses of the crop to differing temporal applications and quantity of irrigation water. Irrigation water treatments were applied to a determinate Hobbitt soybean cultivar and to an indeterminate Williams cultivar by growth stage or combination of growth stages. Growth stage treatments were GGG, OGO, OOG, and OGG, where irrigation (G) or no irrigation (O) in the respective growth stage (vegetative, bloom or pod fill) across the growing season was employed. Observations of the impact of gradient irrigation across six percentage levels of full irrigation were included. In year one, irrigation water was applied only two times, both during the bloom stage, when a water deficit was measured. Subsequent rains minimized any differences in soil water content across the irrigation treatments. Year two was droughty and the cultivars received three irrigation applications during the flowering stage and three applications during the pod fill stage. The effects of these water treatments upon yield, yield components and certain plant morphological characteristics were studied. Maximum grain yields were obtained with treatment OGG. A grain yield reduction appears to be present with the OGO treatment. Yields increased, maturity was delayed, leaf area, leaf area index and number of pods per plant increased with irrigation quantity. Only stem dry matter of the Hobbitt cultivar was significant to irrigation by growth stage. Otherwise, dry matter partitioning of leaf, stem petiole and pod components appeared not to be sensitive to irrigation by growth stage.
Subject Area
Agronomy
Recommended Citation
SCHULZE, LARRY DEAN, "INFLUENCE OF IRRIGATION BY GROWTH STAGE AND PERCENT OF FULL IRRIGATION ON YIELD, YIELD COMPONENTS AND PLANT MORPHOLOGICAL CHARACTERISTICS UPON SOYBEANS (GLYCINE MAX (L.) MERRILL) (GRADIENT)" (1986). ETD collection for University of Nebraska-Lincoln. AAI8706245.
https://digitalcommons.unl.edu/dissertations/AAI8706245