Accumulation and exportation of nutrients by yellow Passion fruit cv. IAC 275

Abstract The mineral nutrition is essential to increase yield and fruit quality of passion fruit. There is no information of nutrient accumulation throughout the production cycle. Thus, in order to assist in the correct nutrients supply and update the recommendations, studies involving cultivars and cultivation techniques are necessary. The aim of this study was to evaluate the plant growth, the nutrient accumulation and the exportation in plants of yellow passion fruit cv. IAC 275. The experimental design was a randomized block, with three replications, where the treatments were evaluation times. Stem length, dry mass matter and nutrient accumulation in aerial part (leaves and stems), fruits and roots were evaluated. The maximum daily accumulation rate and periods of maximum nutritional requirement were calculated, in addition to the nutrient extraction and exportation. The nutrient accumulation at the end of the cycle, at 450 days after sowing, were in g plant-1: N (178.5) > K (162.4) > Ca (70.8) > Mg (14.8) > S (13.3) > P (11.0) and mg plant-1: Fe (827.6) > Mn (130.7) > Zn (69.8) > B (56.7) > Cu (17.8).

摘要 矿质营养对提升西番莲的产量与果实品质至关重要。目前尚无针对西番莲全生产周期养分积累规律的相关研究报道。为辅助科学合理的养分供给并更新现有施肥推荐方案，开展相关品种与栽培技术研究十分必要。本研究旨在评估黄果西番莲品种IAC 275植株的生长状况、养分积累量及养分携出量。试验采用随机区组设计，设置三次重复，处理因素为不同取样时间。测定指标包括株高、干物质重量，以及地上部（叶片与茎秆）、果实和根系中的养分积累量。本研究除计算养分吸收量与携出量外，还推算出植株的日最大养分积累速率及养分最大需求期。在种植周期结束时（播种后450天），植株大量元素积累量（单位：克/株）排序为：氮（N，178.5）> 钾（K，162.4）> 钙（Ca，70.8）> 镁（Mg，14.8）> 硫（S，13.3）> 磷（P，11.0）；微量元素积累量（单位：毫克/株）排序为：铁（Fe，827.6）> 锰（Mn，130.7）> 锌（Zn，69.8）> 硼（B，56.7）> 铜（Cu，17.8）。