Effect of Liquid Pig Manure and Chemical Fertilizers on Shoot Growth and Nitrogen Status of Young “Fuyu” Persimmon Trees

摘要

Liquid pig manure (LPM), digested from pig slurry, has been used as a nutrient source substituting chemical fertilizer (CF) for some crops. This experiment was conducted to evaluate the effect of different level style="font-family:Verdana;">s style="font-family:Verdana;"> of CF and LPM in early July on nitrogen (N) uptake of pot-grown young style="font-family:Verdana;">“ style="font-family:Verdana;">Fuyu style="font-family:Verdana;">” style="font-family:""> style="font-family:Verdana;"> persimmon ( style="font-family:Verdana;">Diospyros kaki style="font-family:Verdana;">). The total N and potassium (K) from CF and LPM applied to a 3 L pot were 1.2 g N and 1.15 g K for the low and 2.4 g N and 2.3 g K for the high level. From 2 weeks after the applications, secondary shoots started to grow for the CF but none for the LPM. Two nutrient sources did not significantly affect the amount of N increase in different tree parts from July 1 to August 6. At the high level, tree total N increased by 80% from 551 mg for the CF and by 31% from 583 mg for the LPM. The nutrient sources did not affect soil pH. The soil that received LPM contained more organic matter (P style="font-family:Verdana;">= 0.048), available phosphorus (P) (P style="font-family:Verdana;">= 0.002), and exchangeable K style="font-family:Verdana;">+ style="font-family:Verdana;"> (P style="font-family:Verdana;">= 0.001) and Mg style="font-family:Verdana;">2+ style="font-family:Verdana;"> (P style="font-family:Verdana;">= 0.009) than the soil that received CF on August 6. These results indicated that N in LPM becomes available later but its effect is more durable than CF.