Kubiku Friday N M, Mandumbu Ronald, Nyamangara Justice, Nyamadzawo George
Bindura University of Science Education, Department of Environmental Science, P. Bag 1020, Bindura, Zimbabwe.
Bindura University of Science Education, Department of Crop Science, P. Bag 1020, Bindura, Zimbabwe.
Heliyon. 2022 Mar 24;8(3):e09164. doi: 10.1016/j.heliyon.2022.e09164. eCollection 2022 Mar.
Rainwater harvesting practices are increasingly gaining recognition as viable adaptation strategies to overcome rainfall variability caused by climate change in semi-arid regions of Zimbabwe. A meta-analysis was conducted to provide a comprehensive quantitative synthesis of biophysical conditions (rainfall, soil texture, N fertility, mulch) under which basins, rippers, and tied ridges affected sorghum yields in semi-arid areas of Zimbabwe. Rainfall amount (<600 mm, 600-1000 mm), soil texture (20 % clay, 20-35 % clay), mulch (basin + mulch, ripper + mulch, tied ridges + mulch), and fertility (0-30 kg N/ha, 30-100 kg N/ha) were used to evaluate the response of sorghum grain yield to rainwater harvesting practices. Grain yield response was compared to the control (conventional practice) using the weighted mean yield difference approach. The results showed comparable sorghum grain yields in all the rainwater harvesting practices across the biophysical conditions, except under rainfall and soil textural classes. Tied ridges had a significant (p < 0.05) negative sorghum grain yield response (-0.25 t/ha) under <600 mm of rainfall, while ripper planting resulted in a substantial negative grain yield response (-0.32 t/ha) under 600-1000 mm of rainfall. Ripper planting reduced grain yield significantly (p < 0.05) (-1.06 t/ha) in soils with 20-35% clay. The results suggest that basins, rippers, and tied ridges did not improve sorghum grain yield across all agronomic conditions.
雨水收集做法越来越被视为一种可行的适应策略，以应对津巴布韦半干旱地区气候变化导致的降雨变化。进行了一项荟萃分析，以全面定量综合生物物理条件（降雨量、土壤质地、氮肥力、覆盖物），在此条件下，盆地、松土机和等高垄作对津巴布韦半干旱地区高粱产量产生影响。降雨量（<600毫米、600 - 1000毫米）、土壤质地（20%粘土、20 - 35%粘土）、覆盖物（盆地 + 覆盖物、松土机 + 覆盖物、等高垄 + 覆盖物）和肥力（0 - 30千克氮/公顷、30 - 100千克氮/公顷）被用于评估高粱籽粒产量对雨水收集做法的响应。使用加权平均产量差异方法，将籽粒产量响应与对照（传统做法）进行比较。结果表明，除了降雨和土壤质地类别外，在所有生物物理条件下，所有雨水收集做法的高粱籽粒产量相当。在降雨量<600毫米时，等高垄对高粱籽粒产量有显著（p < 0.05）的负响应（-0.25吨/公顷），而在降雨量600 - 1000毫米时，松土机种植导致显著的负籽粒产量响应（-0.32吨/公顷）。在粘土含量为20 - 35%的土壤中，松土机种植显著降低了籽粒产量（p < 0.05）（-1.06吨/公顷）。结果表明，盆地、松土机和等高垄在所有农艺条件下均未提高高粱籽粒产量。
