PJB-2018-465
Investigation of soil nutrients and granule composition based on brown stained leaves in a hardy kiwifruit orchard
HAIYAN LV
Abstract
This study was initiated to investigate the causes of brown stains on leaves of hardy kiwifruit plants. Micronutrients of brown stained leaves and petioles (Treatment) and normal leaves and petioles (Control) of the hardy kiwifruit plants were measured. At the same time, soils under these two treatments were collected to measure the micronutrients. The results showed a deficiency of Fe and Cu in the brown stained leaves and petioles. There was no limitation in Fe and Cu contents in 0 ~ 20 cm soil for either treatment. Soil samples were collected from the hardy kiwifruit orchard to evaluate pH, soil organic matter (SOM), soil available N, P, K and Fe. The soil pH gradually decreased with increasing soil depth. The soil available N and SOM decreased with increasing soil depth; however, the soil available Fe increased with increasing soil depth. Soil available Fe was negatively correlated with SOM and soil available N. The soil granule composition was studied. In the orchard, the main soil granule was silt at each soil depth. The analysis of soil available Fe showed that Fe was scarce on the soil surface. The poor water and fertilizer retention properties of silt might have caused Fe deficiency in the leaves and petioles of the hardy kiwifruit plants and the subsequent leaf browning.
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