The combination of increased climate variability with changing weather patterns heightens the importance of the role of planting date on water use in peanut production. Experiments addressing different peanut planting dates were conducted over three years and daytime ecosystem water-use efficiency was determined using the eddy-covaraince method. Results suggest that during the early growing stage in all three planting dates, a late planting date presented by far the highest CO₂ fluxes and daytime ecosystem water-use efficiency. Of immediate significance, the latest planting date was also found to exhibit the highest yield in two of the three years in the experiment. Furthermore, an examination of the last 20 years (2001-2020) of climatological records suggests that a late planting date carries a risk of 40% chance of sub-optimal low temperatures in early fall, potentially reducing the yield in those years. In addition, the late planting date carries 15% probability of ten or more consecutive rainy days in the narrow harvest window, potentially impacting a timely harvest.

气候变率的增加与天气模式的变化相结合，提高了种植日期对花生生产用水量的作用的重要性。针对不同花生种植日期进行了三年多的实验，并使用涡流协方差法确定了白天生态系统的水分利用效率。结果表明，在所有三个种植日期的早期生长阶段，晚种植日期呈现出迄今为止最高的CO ₂通量和白天生态系统用水效率。具有直接意义的是，最近的种植日期也被发现在实验的三年中的两年中表现出最高的产量。此外，对过去 20 年（2001 年至 2020 年）气候记录的检查表明，晚播日期有 40% 的风险在初秋出现次优低温，这可能会降低那些年的产量。此外，在狭窄的收获窗口中，晚播日期有 15% 的概率会出现 10 天或更长时间连续下雨，这可能会影响及时收获。