Field demonstration of the effect of mulching with polyethylene film on plant growth of Japanese pear in a new field and replanted field
2018
Toya, T. | Suzuki, T. | Fujii, Y.
To establish a method for rapidly culturing Japanese Pear trees using polyethylene film mulching, we carried out the following verification tests in a commercial orchard. 1. When aging nursery trees in a new orchard were mulched, the number of shoots and total elongation of shoots increased 1.6 - 1.7-fold. Branch proximal diameter and trunk diameter growth enlarged 1.1-fold compared to the controls. As a result, the number of fruits and total yield were 1.9 - 2.1 times greater than for the controls. 2. When aging nursery trees in a replanted orchard were mulched, the number of shoots and total elongation of bearing shoots increased 1.4 - 1.6-fold. Branch proximal diameter and trunk diameter growth enlarged 1.1 fold compared to the controls. As a result, the number of fruit and yield were 1.8 - 1.9 times greater than the controls in the second year after planting. 3. For the controls in the replanted orchard, the number of shoots and total elongation of shoots were 56 - 62% worse than those of the controls in the newly planted orchard. However, the growth of the mulched trees in the replanted orchard was 83 - 89% worse than the controls in the newly planted orchard. We therefore conclude that mulching can best be used to encourage early bearing of trees in newly planted orchards. 4. At the end of the experiment, the soil in the mulched areas was higher in pH, nitrate nitrogen and exchangeable potassium than in the control areas.
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