Restoration of soil fertility and plant growth for flooded Annona squamosa orchard
Typhoon Morakot (international code: 0908), happened on August 8, 2009, severely damaging nearly 300 ha of A. squamosa orchards in Taitung County, Taiwan. Most of the flooded lands were alluvial soils and river bed soils. The soils lacked organic matters, nutrients, and beneficial microbes. Such poor conditions are not favourable for the growth of A. squamosa seedlings. A field study on A. squamosa was conducted at Taimali Township of Taitung County, Taiwan, using both organic fertilizer (OF; 1.5% nitrogen, 3% phosphorous, 2% potassium, and 60% organic matter) and chemical fertilizer (CF; 20% nitrogen, 5% phosphorus anhydride, and 10% potassium oxide) to enhance its flooded-soil rehabilitation. Results showed that soil conditions (including soil organic matter, phosphorus, and potassium content) and plant growth (e.g., leaf nutrient content and chlorophyll SPAD read) with OF and CF treatments (OF+CF) were significantly better than that of CF treatment alone on a flooded A. squamosa orchard. Therefore, OF+CF was used in this study to estimate the best recipe for application. Results suggest that OF at 10 L plant-1 year-1 and CF at 3 kg plant-1 year-1 were the optimal combination, under which soil nutrient and plant growth were greatly improved in the flooded A. squamosa orchard.
Chang, C.C., Liao, C.Y., Huang, W.Y., Lu, P.S. and Wang, C.H. 2017. Restoration of soil fertility and plant growth for flooded Annona squamosa orchard. Acta Hort. (ISHS) 1166:143-148
typhoon, sugar apple, chemical fertilizer, organic fertilizer, SPAD read