The effect of an NH4+-enhanced nitrogen source on the growth and yield of hydroponically grown maize (Zea mays L.)
1991
Alexander, K.G. | Miller, M.H. | Beauchamp, E.G.
Increased above-ground dry matter and grain yields were found for two hydroponically grown maize hybrids (Pioneer-3925 and Pioneer-3949) when plants were supplied with an NH4+-enhanced nutrient solution (31 percent of total N) compared with a control (4 percent of total N as NH4+). The major difference in yield developed between silking and 2 weeks post-silking and silking and 4 weeks post-silking for the P-3925 and P-3949 respectively. The reduced nitrogen content of the stover (leaves plus stalk) was consistently higher on the NH4+-enhanced nutrient solution. The decreased production of the control treatment may have resulted from a reduced photosynthetic capacity.
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