Year: 1969
Type: dissertation
Abstract: Soil ScienceThe differen tial response of crop growth to light intensity and N levels was studied in a controlle d environm ent and under field condition s for two growing seasons in 1967 and 1968.When N03-N and NH4N03 were used respectiv ely in the controlle d environm ent and field studies, the rates of increase in response of vegetativ e corn growth to N increased with higher light levels.The resulting shadingx N interacti on on growth under field condition s was consiste nt in both years.Reductio n of N0 3 -N in the leaf and reduction of N02-N in the stalk were found to control the differen tial response of N uptake to shading and N levels.Water insoluble protein-N fraction of the leaf and stalk and NH 4 -N fraction of the leaf parallele d total N uptake in response to shading and N levels.After shade removal, light appeared to be critical on the shading-N effect during the vegetativ e period on subseque nt stover and grain yields.The differen tial response of grass and alfalfa in a mixture to shading and N, however, depended on their competit ion for light at low and high N levels.Percentage and dry matter yie1d of a1fa1fa in grass-a1fa1fa mixture (1967) ••• Total N uptake by grass and a1fa1fa in the mixture (1967 air and sail temperatures (1967 and 1968Total dry matter yie1d of grass-1egume mixture ................................... Percentage and dry matter yie1d of grass in grass-1egume mixture ••••••••••••••••••• Percentages and yie1ds of a1fa1fa and vetch in grass-1egume mixture ••••••••••••• CONCI..USIONS.• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• CHAPTER 5...........
Source: eScholarship@McGill (McGill)
DOI: 10.82308/29280
Author: Chan, Wing-To.
Language: English
Subfield: Agronomy and Crop Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W1508863894