Shandong Institute of Pomology, Tai'an, China.
J Sci Food Agric. 2018 Nov;98(14):5435-5443. doi: 10.1002/jsfa.9087. Epub 2018 Jun 14.
The preharvest application of Ca-containing foliar fertilizers can reduce the incidence of bitter pit (BP) in apples and improve fruit quality by increasing the Ca content and decreasing both the N content and the N/Ca ratio in fruits. In this study, we aimed to investigate the control efficacy of Ca-containing fertilizers on the incidence of BP and their effects on the Ca and N contents in bagged 'Fuji' apples by spraying foliar fertilizer containing calcium chloride (CaCl ), calcium nitrate [Ca(NO ) ] or calcium formate [Ca(HCOO) ] at an early stage, five days after full bloom (DAFB) and 40 DAFB, and at a late stage, 80 DAFB and 125 DAFB.
The incidences of BP were reduced significantly by 43.2-73.0%, and the efficacy of spraying at an early stage was significantly higher than that of spraying at a late stage. The Ca content of bagged apple fruits increased whereas the N content and N/Ca ratio decreased after spraying Ca-containing foliar fertilizers; however, the Ca content, N content and N/Ca ratio of apple leaves were differentially influenced.
Foliar fertilizer containing CaCl Ca(NO ) or Ca(HCOO) can be used at an early stage to control BP in apple and improve the quality of bagged apple fruits. © 2018 Society of Chemical Industry.
采前施用含钙叶面肥可以通过增加果实中的钙含量、降低果实中的氮含量和氮钙比来降低苦痘病（BP）的发病率，改善果实品质。本研究旨在通过在盛花期后 5 天（DAFB）、40 DAFB、晚期 80 DAFB 和 125 DAFB 五个时期喷施含氯化钙（CaCl ）、硝酸钙[Ca（NO ）]或甲酸钙[Ca（HCOO）]的叶面肥，来调查含钙肥料对 BP 发病率的控制效果及其对套袋富士苹果钙和氮含量的影响。
BP 的发病率显著降低了 43.2-73.0%，早期喷施的效果明显高于晚期喷施。喷施含钙叶面肥后，套袋苹果果实中的钙含量增加，氮含量和氮钙比降低；然而，苹果叶片的钙、氮含量和氮钙比受到不同的影响。
含 CaCl 、Ca（NO ）或 Ca（HCOO）的叶面肥可在早期用于控制苹果的 BP，提高套袋苹果果实的品质。 © 2018 化学工业协会。
