Interaction of potassium with the form and amount of nitrogen nutrition on growth and nitrogen uptake of maize
1992
Xu, Q.F. | Tsai, C.L. | Tsai, C.Y.
Although a mixture of NO3-N and NH4-N improves the growth of maize plants over that with NO3-N or NH4-N alone, the ratio required for maximum growth remains unclear. Maize hybrid B73 X MoI7 was grown in vermiculite at 25 degrees C in a controlled climate room with a 16-h photoperiod at 280 microE/sec/m2 to evaluate effects of the form and amount of N, and the N/K ratio on the growth of seedlings. The proportion of NH4-N in the mixture required for maximum growth varied according to the total amount of N in the medium. Under low N conditions, seedlings grew faster with a higher proportion of N in the NH4 form while a greater proportion of NO3-N was advantageous at high N conditions. When seedlings were grown under NH4-N as the sole N source, high K levels promoted root growth, and dry matter and N accumulation in the shoot.
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