Effects of Different Nitrogen Application Rates on the Yield and Economic Benefits of Cassava and Peanut in an Intercropping System
To clarify the effects of different nitrogen application rates of cassava on the yield and economic benefits of cas-sava and peanut in an intercropping system,this study used the cassava variety'South China 8'and peanut variety'Yueyou 256'as experimental materials.Under the cassava intercropping the peanut planting mode,five nitrogen application levels of cassava(0,90,135,180,and 225 kg·hm‒2)were established for a total of five treatments,and a randomized field block ex-periment was used to study the effects of different nitrogen application rates on the yield and economic benefits of cassava and peanuts in the intercropping system.The results showed that with increasing nitrogen application rate to cassava,the yields of cassava and peanut first increased and then decreased.The yield reached the highest value when the nitrogen application rate of cassava was 135 kg·hm-2,which was 23.86 t·hm‒2 for fresh cassava and 2 027.5 kg·hm‒2 for peanut pods,which was 17.9%and 23.9%higher than that of N0,respectively.There was no significant difference in yield among all treatments(p>0.05).Compared with those under N0,the biological yield per plant,plant height,stem diameter,and tuber number of cassava plants under N135 increased,and the biological yield per hole,100-pod weight,and 100-kernel weight of peanut plants also in-creased.Under the cassava intercropping peanut system,the leaf area index of the peanut was 3.72-4.64,which increased with the increasing nitrogen application rate,and the light transmittance ranged from 7.09%-11.73%.This trend was opposite to that of the leaf area index,which showed a downward trend with increasing nitrogen application rate.The total output and eco-nomic benefits of cassava and peanut first increased and then decreased,and both reached their highest values when the nitro-gen application rate of cassava was 135 kg·hm‒2.Compared with those of cassava without nitrogen application,the total output value and economic benefits increased by 4 514.9 yuan·hm‒2 and 3 634.4 yuan·hm‒2,respectively.The ratio of output to input reached 3.80 in N135,which was an increase of 0.19 compared with that in N0.The remaining treatments showed a decrease,and there was no significant difference between treatments(p>0.05).In summary,under the cassava-peanut intercropping system,nitrogen fertilizer application to cassava plants can increase the yield and economic benefits of cassava and peanuts and improve the agronomic traits of cassava and peanuts.When the nitrogen application rate of cassava was 135 kg·hm‒2,the yield and economic benefits of cassava and peanuts were the greatest.
万方数据
维普
