??????????????????????????????????????????????????????????????????????????????????? | Effects of potassium concentration reduction on growth and nutrient accumulation of Chinese kale grown in sand culture
2020
Apiwat Choiesombat(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Soil Science) | Punyisa Trakoonyingcharoen(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Soil Science) | Kumut Sangkhasila(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture at Kamphaeng Saen. Department of Soil Science)
The objective of this experiment was to find a suitable fertilizer formula that can minimize the accumulation of potassium in Chinese Kale, not to exceed the recommendation for safe consumption of chronic kidney disease (CKD) patient. Rate of Potassium fertilizer application was reduced from that of recommended by the Department of Agriculture (DOA). Complete randomized design experiment was carried out with 4 treatments of different ratio of N:P2O5:K2O in the fertilizers and 5 replications. The four treatments consisted of treatment 1 (T1): control (No fertilizer application); treatment 2 (T2) 12:8:4; treatment 3 (T3) 12:8:6 and treatment 4 (T4) 12:8:8. All treatments were applied at rate of 60 kg/rai. The fertilizer was split evenly and applied for 3 times. Each Chinese kale plant was grown in 3 kg pot of sand culture. Micronutrients and trace elements were applied for all treatments. Daily Irrigation was applied in such a way that maintains sand moisture content to their field capacity. At harvest time, fresh and dry weights, potassium and sodium concentrations in Chinese Kale were collected. The results showed that Kale yield of T2 was significantly lower than 90 percent of T4 treatment (DOA recommendation). Potassium concentration in Chinese kale of T2 was significant lowest among treatments. The potassium content of T2 treatment plant was under CKD recommendation (LT 200 mg/100 g FW). Sodium content in plant were not significant among treatments. However, sodium contents in T1, T2 and T3 plants were under CKD recommendation (LT 50 mg/100 g FW). Therefore, Chinese kale plans grown in sand culture with 12:8:4 fertilizer at the rate of 60 kg/rai (T2) can give low potassium and sodium concentrations
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