|
The foliar spray of calcium compound extracted from oyster shell (OS-Ca) appeared to have more effectiveness on the calcium translocation into leaves, fruit skin and flesh than other calcium sources such as calcium nitrate, calcium chloride, calcium acetate and CaCO₃. However, no significant difference was found in the core of fruit. The foliar spary of OS-Ca with the concentration of 608 ㎍·g^(-1) at late growth stage increased calcium content in leaves, skin and flesh. But there was difference in calcium accumulation pattern among cultivars. More calcium was detected in leaves, peel, flesh of ´Fuji´ and leaves, peel, flesh, core of ´Jonagold´, while calcium increased in the peel and leaves of ´Tsugaru´ apples. Recovered calcium from fruits treated OS-Ca mainly belonged to water soluble or exchangeable forms.
|