Nitrogen uptake rate with compost application and its effect on the sugar content of sweet corn (Zea mays L.)

摘要

A series of field experiments was conducted to test whether nitrogen (N) similarly affected crop quality when supplied in compost or in chemical fertilizer. N was supplied to sweet corn via either compost or chemical fertilizer, and soil nitrate-N, Nuptake and the sugar content of sweet corn were investigated. Soil nitrate-N integrated from the date of application to harvest and the amount of N uptake by sweet corn were positively correlated irrespective of the N source. This finding may indicate that the amount of N uptake was determined primarily by the amount of nitrate-N supplied by the compost in addition to the chemical fertilizer. The growth of early stage was accelerated by the application of compost, and the date of maximum sugar content became earlier with increased compost application. The relationship between sugar content and N uptake was the same irrespective of the N source when compared at the time of maximum sugar content for each treatment. So we concluded that the sugar contentwas determined by the amount of N uptake regardless of the N source (compost application or chemical fertilizer application).