Effect of continuous cropping of corn [Zea mays] on the mineral uptakes
1998
Yamamoto, S. (Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) | Mino, Y.
Effect of continuous cropping of corn (Zea mays L. cv. P3358) on the mineral uptakes was examined using fields cultivated with corn/barley (summer/winter) (continuous cropping) or Italian ryegrass (control) for 12 years. Dry weight of corn was suppressed during the growing period by continuous cropping. The suppression was remarkable in the ear and leaf blade at late growth stage. K concentration was increased slightly by continuous cropping, while Ca, Mg, Zn, Mn and Cu were suppressed. The suppression in Mn concentration was remarkable at late growth stage. Uptakes of K and Fe mostly occurred before milk rips stage and were scarcely affected by continuous cropping. Uptakes of Ca, Mg, Zn, Mn and Cu, on the other hand, continued until the late growth stage and were suppressed by continuous cropping. The suppression of Mn and Zn uptakes increased at late growth stage. The results obtained imply that decreases in mineral uptakes at late growth stage are one of the causes of injury
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