Abstract:

The effects of nitrogen application on yield and plant nutrient uptake of planting tartary buckwheat variety ‘Yunqiao No.1’ after flue-cured tobacco harvest were studied to select the best nitrogen application level in Yuxi. The results showed that with the increase of nitrogen application, the yield increased first and then decreased, the growth period was prolonged and the plant height was increased. There was no significant difference in major agronomic characters and yield components. However, the nitrogen application amount of 225 kg/hm ² had the largest main stalk pitch number and primary branches, and the yield components of grain number and weight per plant were relatively good, so the yield reached 2900 kg/hm², which was 720 kg/hm² or 33.03% higher than that of CK. In terms of plant nutrient uptake, with the increase of nitrogen application, the nitrogen uptake of the whole plant showed a trend of increasing first and then decreasing, and the variation trend of phosphorus and potassium uptake was consistent, and the plant nutrient uptake was the highest with nitrogen application level of 225 kg/hm², followed by nitrogen application at 150 kg/hm². Therefore, under this experiment, the optimal nitrogen application rate is 150 kg/hm² to 225 kg/hm², which has not only high yield, but also the highest uptake of plant nutrients.

Key words: tartary buckwheat, nitrogen application, yield, plant nutrition, absorbing capacity