Effects of Different Calcium Application on the Main Agronomic Traits,Yield,and Quality of High Oleic Acid Peanuts and Economic Benefits Evaluation
[Objective]The aim of this study was to investigate the impact of varying calcium application rates on the agronomic characteristics,yield,quality,and economic returns of high oleic acid peanut cul-tivars,thereby establishing a theoretical foundation for the judicious use of calcium fertilizers and the re-finement of cultivation practices for high oleic acid peanuts.[Method]The methodology encompassed the application of four distinct calcium fertilizer rates(0,75,150 and 225 kg/hm2)to the high oleic acid peanut cultivar Jihua 19 under field conditions,with the objective of assessing the influence of calcium fertilization on the aforementioned parameters.[Result]The findings revealed that,in comparison to the control,the SPAD values increased significantly following calcium application,with increments ranging from 6.71%to 30.63%.Notably,the T2 treatment demonstrated the most pronounced effect,with a sig-nificant enhancement in SPAD values of 37.55%,43.44%,47.89%and 37.49%during the seedling,flowering needle,podding,and full fruit stages,respectively.Additionally,the main stem diameter,nodule count,and nodule dry weight exhibited significant increases of 25.70%to 26.40%,31.68%to 96.04%and 13.43%to 97.51%,respectively.The T2 treatment notably increased the nodule count by 96.04%and the dry weight of nodules by 97.51%,indicating the most effective improvement in nodule characteristics.In contrast to the control,calcium application led to increased fruit weight,kernel weight,shelling rate,yield,oleic acid content,oil-to-oil ratio,and net profit,with increments ranging from 4.28%to 10.52%,4.92%to 9.31%,1.19%to 3.77%,3.83%to 10.86%,0.19%to 1.51%,0.19%to 3.45%and 4.14%to 14.22%,respectively.The T2 treatment yielded the most substantial overall improve-ments,with increases of 10.52%,9.31%,3.77%,10.86%,1.25%,2.5%and 14.22%,respectively.Furthermore,the trend of SPAD values and yield initially increased and subsequently decreased follow-ing calcium application,with no significant quality enhancement observed at a calcium fertilizer rate of 75 kg/hm2.This suggests that neither insufficient nor excessive calcium fertilization can achieve optimal outcomes.[Conclusion]In conclusion,based on the collective results,the optimal calcium fertilizer ap-plication rate for this study is determined to be 150 kg/hm2.
high oleic acid peanutscalcium fertilizeryield and qualityagronomic traitseconomic benefit
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