A review of time of planting in strawberry: yields are higher with early to intermediate plantings

Time of planting affects the productivity of crops. A review was conducted to determine the effect of time of planting on the performance of strawberry plants in warm locations (<i>n</i> = 42 experiments). Additional information was collated on the relationship between yield, temperature and the size of the nursery plants and their carbohydrates. There were linear (<i>n</i> = 23) or quadratic relationships (<i>n</i> = 7) between yield and the time of planting. In the linear relationships, yields decreased as planting was delayed. In the quadratic relationships, optimum yields occurred with an intermediate planting, with lower yields with an earlier or a later planting. There was a quadratic relationship between yield and the time of planting when the first planting was in early September in the Northern Hemisphere or in early March in the Southern Hemisphere. Low yields with early plantings were associated with small plants, few stored reserves and inadequate temperatures in the nursery. Low yields with later plantings were associated with a short production season. Research is required to determine if earlier plantings are required in subtropical areas to reduce the impacts of global warming. The relationship between yield and temperatures in the nurseries needs to be explored further.

播种期会显著影响作物的生产性能。本综述研究旨在明确播种期对温暖区域草莓植株生长表现的影响，共纳入42项试验（n = 42）。此外，本研究还整理汇编了产量、温度与育苗植株体量及其碳水化合物储备之间的关联信息。
研究发现，产量与播种期之间存在线性相关（n = 23）或二次曲线相关（n = 7）：在线性相关场景中，播种延迟会导致产量逐步降低；在二次曲线相关场景中，中间时段播种可获得最优产量，过早或过晚播种均会造成产量下降。
当北半球首次播种时间为9月初、南半球首次播种时间为3月初时，产量与播种期呈现显著的二次曲线相关。早播产量偏低的原因，与育苗期植株体量偏小、贮藏养分不足以及温度条件不适宜密切相关；晚播产量偏低则与生产季时长过短直接相关。
当前仍需开展相关研究，以明确亚热带区域是否需要提前播种以缓解全球变暖带来的不利影响，同时育苗期温度与产量之间的具体关联机制也有待进一步深入探究。