College of Water Conservancy and Civil Engineering, South China Agriculture University, No. 483, Wushan Road, Tianhe District, Guangzhou 510642, China.
College of Engineering, National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology (NPAAC), South China Agriculture University, No. 483, Wushan Road, Tianhe District, Guangzhou 510642, China.
Sensors (Basel). 2021 Jul 29;21(15):5142. doi: 10.3390/s21155142.
The goal of this research is to use a WORKSWELL WIRIS AGRO R INFRARED CAMERA (WWARIC) to assess the crop water stress index (CWSI) on tomato growth in two soil types. This normalized index (CWSI) can map water stress to prevent drought, mapping yield, and irrigation scheduling. The canopy temperature, air temperature, and vapor pressure deficit were measured and used to calculate the empirical value of the CWSI based on the Idso approach (CWSI). The vegetation water content (VWC) was also measured at each growth stage of tomato growth. The research was conducted as a 2 × 4 factorial experiment arranged in a Completely Randomized Block Design. The treatments imposed were two soil types: sandy loam and silt loam, with four water stress treatment levels at 70-100% FC, 60-70% FC, 50-60% FC, and 40-50% FC on the growth of tomatoes to assess the water stress. The results revealed that CWSI and CWSI proved a strong correlation in estimating the crop water status at R above 0.60 at each growth stage in both soil types. The fruit expansion stage showed the highest correlation at R = 0.8363 in sandy loam and R = 0.7611 in silt loam. VWC and CWSI showed a negative relationship with a strong correlation at all the growth stages with R values above 0.8 at < 0.05 in both soil types. Similarly, the CWSI and yield also showed a negative relationship and a strong correlation with R values above 0.95, which indicated that increasing the CWSI had a negative effect on the yield. However, the total marketable yield ranged from 2.02 to 6.8 kg plant in sandy loam soil and 1.75 to 5.4 kg plant in silty loam soil from a low to high CWSI. The highest mean marketable yield was obtained in sandy loam soil at 70-100% FC (0.0 < CWSI ≤ 0.25), while the least-marketable yield was obtained in silty loam soil 40-50% FC (0.75 < CWSI ≤ 1.0); hence, it is ideal for maintaining the crop water status between 0.0 < CWSI ≤ 0.25 for the optimum yield. These experimental results proved that the WWARIC effectively assesses the crop water stress index (CWSI) in tomatoes for mapping the yield and irrigation scheduling.
本研究旨在使用 WORKSWELL WIRIS AGRO R 红外相机 (WWARIC) 评估两种土壤类型中番茄生长的作物水分胁迫指数 (CWSI)。这个归一化指数 (CWSI) 可以通过地图来防止干旱，映射产量和灌溉计划来评估水分胁迫。测量了冠层温度、空气温度和水汽压亏缺，并根据伊迪丝方法 (CWSI) 计算了 CWSI 的经验值。还在番茄生长的每个生长阶段测量了植被含水量 (VWC)。研究采用 2×4 析因实验设计，完全随机区组设计。处理是两种土壤类型：沙壤土和粉壤土，在 70-100%FC、60-70%FC、50-60%FC 和 40-50%FC 四个水分胁迫处理水平下，评估对番茄生长的水分胁迫。结果表明，在两种土壤类型的每个生长阶段，CWSI 和 CWSI 在估计作物水分状况方面都具有很强的相关性，R 大于 0.60。果实膨胀阶段在沙壤土中 R = 0.8363 和粉壤土中 R = 0.7611 时相关性最高。在两个土壤类型中，VWC 和 CWSI 呈负相关，在所有生长阶段的相关性均较强，R 值均大于 0.8，P < 0.05。同样，CWSI 和产量也呈负相关，相关性较强，R 值大于 0.95，表明 CWSI 增加对产量有负面影响。然而，在沙壤土中，总可销售产量范围为 2.02 至 6.8 公斤/株，在粉壤土中为 1.75 至 5.4 公斤/株，从低到高的 CWSI。在沙壤土中，70-100%FC (0.0 < CWSI ≤ 0.25) 时获得的平均可销售产量最高，而在粉壤土中，40-50%FC (0.75 < CWSI ≤ 1.0) 时获得的最低可销售产量；因此，保持作物水分状况在 0.0 < CWSI ≤ 0.25 之间是获得最佳产量的理想选择。这些实验结果证明，WWARIC 可以有效地评估番茄的作物水分胁迫指数 (CWSI)，以映射产量和灌溉计划。
Zotero 插件
