| Analysis of effect of nitrogen application on apple yield on Loess Plateau using meta\|analysis |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2020.06.15 |
| Key Words: apple tree nitrogen application yield increasing effect meta\|analysis Loess Plateau |
| Author Name | Affiliation | | ZHAO Yue | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | HU Tiantian | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LUO Lihua | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Can | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
|
| Hits: 758 |
| Download times: 405 |
| Abstract: |
| In order to explore the influencing factors of nitrogen (N) application on apple yield on the Loess Plateau, this research was based on published experimental data, and used the meta\|analysis method to quantitatively analyze the influence of climate, altitude, soil type, tree age, land area per plant, N consumption on the yield with N application, and carried out path analysis on each influencing factor. The results showed that when the annual precipitation was less than 500 mm in the same year, the yield increased by 29.83%, which decreased with the increase in the annual precipitation. When the average temperature was more than or equal to 10℃, the effect of N on yield was positive, but when the average temperature was less than 10 ℃, the effect was not significant (P>0.05). Nitrogen treatment in Heilu soil and Lou soil was effective in increasing the yield by 26.1% (95%CI:13.08%~39.11%) (CI was the confidence interval, the same below) and 34.53% (95%CI:13.88%~55.19%), respectively, but no significant increase in loess (P>0.05). When the altitude was less than 850m, the yield increase rate of apple from N application was significantly increased (P<0.05), and the yield increased by 29.46% (95%CI:16.98%~41.93%), and decreased with the increase in altitude. With N application, the yield increase of the fruit trees with older tree was more obvious. When the tree was more than 10 years, the yield increase rate was 26.93% (95%CI:14.64%~39.22%), which decreased with the decrease of tree age. Application of N fertilizer in different planting densities had different yield increasing effect, and the best effect was 55~110 plant·666.7m-2, reaching 28.70% (95%CI:18.12%~39.28%). When N application was 0.25~0.50 kg·plant-1, the stimulation effect was most obvious (P<0.05). When N application was more than 0.50 kg·plant-1, there was no significant stimulation effect (P>0.05). Path analysis results showed that planting density, annual precipitation and N application rate were the three major factors that affected apple yield increase under N application, followed by altitude, and the average annual temperature and the tree age had similar but little effect on apple yield increase. It can be seen that N fertilization was closely related to external factors, and a suitable range of N comprehensively combined with the above conditions was more conducive to increase production, and can also provide references for fertilization and field management in the area. |
|
|
|