Meta-analysis of the Effect of Planting Patterns and Irrigation Systems on Potato Yield and Water Productivity

Studies on the effect of planting pattern on yield and water productivity in potato production have a long history at the international and national levels. It is difficult to draw general conclusions and recommendations for the application of appropriate treatments due to the differences in treatments and research findings. Therefore, the objective of this study was to apply a meta-analysis approach to summarize the results of several investigations on the effect of planting patterns on yield and water productivity in potato production. Consequently, several scientific papers published by the international and national researchers on potato planting patterns were reviewed, screened and analyzed. Control and experimental treatments have been applied in studies on the investigation of the effect of planting pattern on yield and water productivity in potato production. The spacing of potato planting rows in different experiments including 60, 75, 120 and 150 cm has been reported as a single-row and/or two-row under drip and/or sprinkler irrigation systems. The average yield was 33000 kg ha-1 and water productivity was 5.46 kg m-3 in the control treatment with row spacing of 75 cm. Combined results showed that increased yield by changing the planting spacing from the 75 cm to 60 cm 33%, to 120 cm 18% and to 150 cm 8%, respectively. While, the application of planting spacing treatments on water productivity was not statistically significant. Minor positive effects were observed compared to the effect of control treatment. The most positive effect was in the planting spacing of 60 cm (10%). Changes in yield and water productivity in two-row cultivations compared to single row under drip system decreased by 7% , while increased yield and water productivity were 4.6% and 16% under sprinkler system, respectively. Studies on the effect of planting pattern on yield and water productivity in potato production have a long history at the international and national levels. It is difficult to draw general conclusions and recommendations for the application of appropriate treatments due to the differences in treatments and research findings. Therefore, the objective of this study was to apply a meta-analysis approach to summarize the results of several investigations on the effect of planting patterns on yield and water productivity in potato production. Consequently, several scientific papers published by the international and national researchers on potato planting patterns were reviewed, screened and analyzed. Control and experimental treatments have been applied in studies on the investigation of the effect of planting pattern on yield and water productivity in potato production. The spacing of potato planting rows in different experiments including 60, 75, 120 and 150 cm has been reported as a single-row and/or two-row under drip and/or sprinkler irrigation systems. The average yield was 33000 kg ha-1 and water productivity was 5.46 kg m-3 in the control treatment with row spacing of 75 cm. Combined results showed that increased yield by changing the planting spacing from the 75 cm to 60 cm 33%, to 120 cm 18% and to 150 cm 8%, respectively. While, the application of planting spacing treatments on water productivity was not statistically significant. Minor positive effects were observed compared to the effect of control treatment. The most positive effect was in the planting spacing of 60 cm (10%). Changes in yield and water productivity in two-row cultivations compared to single row under drip system decreased by 7% , while increased yield and water productivity were 4.6% and 16% under sprinkler system, respectively. Studies on the effect of planting pattern on yield and water productivity in potato production have a long history at the international and national levels. It is difficult to draw general conclusions and recommendations for the application of appropriate treatments due to the differences in treatments and research findings. Therefore, the objective of this study was to apply a meta-analysis approach to summarize the results of several investigations on the effect of planting patterns on yield and water productivity in potato production. Consequently, several scientific papers published by the international and national researchers on potato planting patterns were reviewed, screened and analyzed. Control and experimental treatments have been applied in studies on the investigation of the effect of planting pattern on yield and water productivity in potato production. The spacing of potato planting rows in different experiments including 60, 75, 120 and 150 cm has been reported as a single-row and/or two-row under drip and/or sprinkler irrigation systems. The average yield was 33000 kg ha-1 and water productivity was 5.46 kg m-3 in the control treatment with row spacing of 75 cm. Combined results showed that increased yield by changing the planting spacing from the 75 cm to 60 cm 33%, to 120 cm 18% and to 150 cm 8%, respectively.