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首页> 外文期刊>Agrociencia >CABBAGE GROWTH AND PRODUCTION IN RELATION TO PLANT DENSITY AND NITROGENOriginal Title (non-English) CRECIMIENTO Y PRODUCCION DE REPOLLO EN PUNCION DE LA DENSIDAD DE POBLACION Y NITROGENO [Spanish]
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CABBAGE GROWTH AND PRODUCTION IN RELATION TO PLANT DENSITY AND NITROGENOriginal Title (non-English) CRECIMIENTO Y PRODUCCION DE REPOLLO EN PUNCION DE LA DENSIDAD DE POBLACION Y NITROGENO [Spanish]

机译：与植物密度和氮有关的白菜生长和生产原始标题（非英语）人口密度和氮的刺鼻中的白菜生长和生产[西班牙语]

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摘要

At present, the Brazilian market prefers cabbage (Brassica oleracea var. capitata) of smaller size, which can be achieved by increasing population density; yet this management can alter the optimum rate of nitrogen (N), its second most required nutrient. This study was conducted in the Universidade Estadual Paulista, Jaboticabal, Sao Paulo, Brazil, from February to June 2004. The objective was to evaluate the effect of population density: 31 250 (DI) and 46 875 plants ha(-1) (D2) with 0, 100, 200 and 300 kg N ha-1 on the growth and production of cabbage Astrus. The experimental design consisted of randomized blocks with a 2 x 4 factorial arrangement and three replicates. Statistical analysis were a variance analysis (F test), the Tukey test for population density averages and polynomial regression for the N rates. In D1, an increase was recorded in the number of inner and outer leaves, dry matter of inner and outer leaves, the stem diameter at the insertion of the head, and the stem dry and fresh matter. The maximum size of the plant in D2 was 1.57 kg and was obtained with 300 kg N ha(-1), while in D1 it was 2.1 kg and was obtained with 244 kg N ha(-1). The optimal economic rate in 131 was 227.1 kg N ha(-1). The highest yield (72.7 t ha(-1)) was obtained with the highest N rate in D2. Smaller cabbage heads, commercially preferred, were obtained without the application of N, regardless of plant population.
机译：目前，巴西市场偏爱较​​小尺寸的卷心菜（Brassica oleracea var。capitata），这可以通过增加人口密度来实现。然而，这种管理方法可以改变其第二大需求营养素氮（N）的最佳比例。这项研究于2004年2月至6月在巴西圣保罗Jaboticabal的Estostual Paulista大学进行。目的是评估种群密度的影响：31 250（DI）和46 875株植物ha（-1）（D2 ）分别以0、100、200和300 kg N ha-1对白菜Astrus的生长和产量产生影响。实验设计由2×4析因排列和三个重复的随机块组成。统计分析为方差分析（F检验），Tukey检验人口密度平均值，多项式回归为N率。在D1中，记录了内叶和外叶的数量，内叶和外叶的干物质，头部插入时的茎直径以及茎干和新鲜物质的增加。在D2中，最大植物尺寸为1.57 kg，使用300 kg N ha（-1）可获得;而在D1中，最大植物为2.1 kg，使用244 kg N ha（-1）获得。 131国的最佳经济率是227.1 kg N ha（-1）。在D2中，以最高的N速率获得最高的产量（72.7 t ha（-1））。无论植物种群如何，都不需要施用氮就可以获得较小的白菜头，这是商业上优选的。

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