Nutritional status of coriander under fertigation depths and pulse and continuous drip irrigation

ABSTRACT The objective of this study was to evaluate the nutritional status of coriander cultivar Verdão under fertigation depths and pulse and continuous drip irrigation. The experiment was conducted in a protected environment at the Universidade Federal Rural de Pernambuco, Recife, PE, Brazil (8° 1’ 6.50” S, 34° 56’ 46” W and altitude of 6.5 m), in the randomized block design in 2 x 5 factorial scheme, with three repetitions. Treatments consisted of five irrigation depths (40, 60, 80, 100 and 120% of crop evapotranspiration - ETc) and two types of fertigation application (pulse and continuous). At 27 days after sowing, the aerial part of 48 plants per plot was collected for subsequent quantification of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, copper and zinc concentrations. Pulse fertigation combined with ETc replacement depths below 100% promoted higher leaf concentrations of phosphorus, sulfur, iron and manganese. Continuous fertigation combined with 100% ETc depth induced sulfur deficiency in the crop and, combined with 40% ETc depth, promoted the highest calcium concentration. Regardless of the type of application, ETc replacement depths from 82.7 and 40% provide adequate leaf concentrations of nitrogen and magnesium, respectively. Regardless of the applied depth, pulse fertigation reduced the leaf concentrations of magnesium.

摘要 本研究旨在评估不同滴灌施肥深度及脉冲式、连续式滴灌条件下芫荽（coriander）品种Verdão的营养状况。试验于巴西伯南布哥州累西腓市伯南布哥联邦农村大学的保护地内开展，地理坐标为南纬8°1′6.50″、西经34°56′46″，海拔6.5 m，采用2×5因子试验设计的随机区组设计，设置3次重复。试验处理包含5个灌溉施肥梯度（分别为作物蒸散量（crop evapotranspiration，ETc）的40%、60%、80%、100%与120%）以及2种滴灌施肥方式（脉冲式与连续式）。播种后27天，采集每个小区内48株植株的地上部分，用于后续定量测定氮、磷、钾、钙、镁、硫、铁、锰、铜、锌的含量。结果表明，脉冲式滴灌施肥配合低于100% ETc的补灌深度，可提升芫荽叶片中磷、硫、铁、锰的含量；连续式滴灌施肥配合100% ETc补灌深度会导致作物出现硫素缺乏症状，而配合40% ETc补灌深度则可使叶片钙含量达到最高水平。无论滴灌施肥方式如何，分别采用82.7%与40%的ETc补灌深度，可使叶片氮、镁含量分别处于适宜水平；无论补灌深度如何，脉冲式滴灌施肥均会降低叶片镁含量。