บทคัดย่องานวิจัย

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Techniques for monitoring crop nitrogen status in corn.

Blackmer, T. M.; Schepers, J. S.;

Communications in Soil Science and Plant Analysis Year: 1994 Vol: 25 Issue: 9-10 Pages: 1791-1800 Ref: 16 ref.

1994

บทคัดย่อ

Techniques for monitoring crop nitrogen status in corn.

ABSTRACT :

 

Irrigated maize was grown at 3 sites in Nebraska and given various fertilizer N rates. Leaf N concentration and chlorophyll meter readings of the ear leaf were taken at growth stage R%. Leaf N concentrations were difficult to interpret because of luxury consumption and the lack of consistent critical levels across hybrids and growth stages. The chlorophyll meter reading was not confounded by luxury N consumption but required an in-field reference given extra N. Chlorophyll meter readings were highly correlated with grain yield, provided early detection of N deficiency, and could be used in N management through fertigation. The postharvest stalk nitrate test accurately identified excess N available to the maize crop. This test did not require in-field reference strips and provided information for planning fertilizer N management in the following season.