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首页> 外文期刊>Revista Brasileira de Fruticultura >Aduba??o nitrogenada na forma??o de porta-enxertos de limoeiro 'Cravo' em tubetes
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Aduba??o nitrogenada na forma??o de porta-enxertos de limoeiro 'Cravo' em tubetes

机译：管中“丁香”柠檬砧木形式的氮肥

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A greenhouse experiment was carried out to evaluate the effects of nitrogen sources and rates on growth of rangpur lime seedlings in dibble tubes. The treatments comprised the combinations of two sources (calcium nitrate and urea) and four rates of nitrogen (0.15; 0.30; 0.45; and 0.60 g L-1), and an additional control treatment without N fertilization. The treatments were disposed according to a randomized complete block design as a 2 x 4 + 1 factorial arrangement with four replications. Nitrogen fertilizers (10 mL per dibble tube) were applied weekly during 15 weeks, starting at 56 days after seed germination. The data revealed effects of N rates on plant height, stem diameter and shoot dry matter yield. The effects of the N rates on these parameters were adjusted to quadratic regression models with maximum values corresponding to the rate of 0.37 g N L-1. The growth was reduced at rates higher than 0.37 g N L-1 of either calcium nitrate or urea. The effects of calcium nitrate and urea were different on root dry matter yield. For urea, root dry matter increased with the N rate, but for calcium nitrate the effect was described by a quadratic model, with maximum value corresponding to the rate of 0.35 g N L-1. Nitrogen, phosphorus, potassium, calcium, and magnesium accumulation in the shoot showed a direct relationship with dry matter yield.
机译：进行了温室试验，以评估氮源和氮素用量对滴灌管中兰普尔石灰幼苗生长的影响。处理包括两种来源（硝酸钙和尿素）和四种氮素比率（0.15; 0.30; 0.45;和0.60 g L-1）的组合，另外还有不施氮的对照处理。根据随机完整区组设计以2 x 4 +1因子分解排列处理，重复四次。从种子发芽后第56天开始，在15周内每周施用氮肥（每个滴管10 mL）。数据显示了氮肥施用量对株高，茎粗和茎干物质产量的影响。将N比率对这些参数的影响调整为二次回归模型，其最大值对应于0.37 g N L-1的比率。生长速率高于硝酸钙或尿素的0.37 g N L-1。硝酸钙和尿素对根系干物质产量的影响不同。对于尿素，根系干物质随氮含量的增加而增加，但对于硝酸钙，其效果由二次模型描述，最大值对应于0.35 g N L-1的含量。芽中氮，磷，钾，钙和镁的积累与干物质产量直接相关。

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