红壤水分条件对温州蜜柑果实生长与产量的影响

Effects of red soil moisture condition on Citrus unshiu Marc. cv. Miyagawa Wase fruit growth and yield

以宫川温州蜜柑（Citrus unshiu Marc．cv．Miyagawa Wase）橘树为材料，于2003—2004年利用土壤水分探头实时监测柑橘果实膨大期的红壤水分，研究了红壤相对含水量（RSM）对柑橘果实生长及产量构成因子的影响。结果表明：RSM由30％增加到90％，柑橘果实纵径和横径均递增，而纵径／横径比值则递减，周累积果实增量纵径（1．60～1．74cm）〈横径（1．95～2．26cm），红壤水分降低对柑橘果实纵向膨大限制影响大于横径；果实产量构成因子呈抛物线趋势变化，且RSM为75％时达到最大值。综合柑橘果实生长及其产量构成因子，RSM在75％时最利于柑橘果实生长及高产。

The red Wase was real-time （RSM） on the fruit soil moisture at fruit-swelling stage of Citrus unshiu Marc. cv. Miyagawa monitored by FDR in 2003-2004 to study the effects of relative soil moisture growth and yield indices of the citrus. When the RSM increased from 30% to 90%, both the fruit length and the fruit diameter were increasing while the ratio of fruit length to fruit diameter was in adverse, and the weekly accumulative increment of fruit diameter （ 1.95- 2.26 cm） was higher than that of fruit length （ 1.60-1.74 cm）. The fruit yield index had a parabolic variation trend with the increase of RSM, and reached the maximum when RSM was 75 %. After an integrative consideration on the fruit growth and yield index, 75% RSM was suggested to be most beneficial to the fruit growth and high yielding of the citrus.