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Nitrogen Management of Potato Based on SPAD Diagnosis

Author: LiXiuHua
Tutor: FanMingShou
School: Inner Mongolia Agricultural University
Course: Botany
Keywords: Potato Nitrogen rate Quality Nitrogen use efficiency Diagnosis Fertilization recommendation model
CLC: S532
Type: Master's thesis
Year: 2009
Downloads: 41
Quote: 0
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Abstract


This article through field trials in Hohhot study the impact of different nitrogen levels on potato fertility , yield, quality and nitrogen use efficiency ; application verification and previously established SPAD diagnostic threshold and dressing model , but also on the SPAD value optimization, and established the optimization SPAD diagnostic threshold and recommend dressing model . The results show that : The potato root to shoot ratio with the increase of the amount of nitrogen was reduced after the first increase ; yield with increasing nitrogen rate was linear plus platform model ; plant nitrogen accumulation , nitrogen uptake rate , leaf SPAD, leaf nitrogen content and plant nitrogen content increased with increasing amount of nitrogen . 2 for the same species , the size of the SPAD value can reflect the level of production , but the the SPAD threshold for growth stages and the basis of soil fertility conditions . Optimization SPAD value (SALM) closer to the nitrogen content of plants and the relationship of the relative yield . 35 days and come the Hohhot region grams new One after emergence ( tuber formation ) , respectively, and 55 days after emergence ( tuber expansion period ) the SALM diagnostic threshold to 1.79 and 1.48 . 4 Hohhot region grams new One fourth leaf blades fertilization recommendation model optimization SPAD value (SALM) diagnosis of tuber formation : N (kg/667m ~ 2) = (3.1-1.69 * x) (1.76 * x 0.4) * 34.3; tuber expansion period : N ( kg/667m ~ 2) = (2.6-1.70 * x) (1.76 * x 0.4) * 34.3, where x is the SALM value .

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CLC: > Agricultural Sciences > Crop > Tuber Crops > Potatoes ( potatoes )
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