...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Revista Brasileira de Fruticultura >Pineapple yield and fruit quality effected by NPK fertilization in a tropical soil
【24h】

Pineapple yield and fruit quality effected by NPK fertilization in a tropical soil

机译：NPK施肥对热带土壤菠萝产量和果实品质的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There is a lack of information about fertilization of pineapple grown in the State of S?o Paulo, Brazil. So a field experiment with pineapple 'Smooth Cayenne' was carried out to study the effects of NPK rates on yield and fruit quality. The trial was located on an Alfisol in the central part of the State of S?o Paulo (Agudos county). The experimental design was an incomplete NPK factorial, with 32 treatments set up in two blocks. The P was applied only at planting, at the rates of 0; 80; 160 and 320 kg/ha of P2 05, as superphosphate. The N and K2O rates were 0; 175; 350, and 700 kg/ha, applied as urea and potassium chloride, respectively, divided in four applications during the growth period. Response functions were adjusted to yield or to fruit characteristics in order to estimate the nutrient rates required to reach maximum values. The results showed quadratic effects of N and K on yield and a maximum of 72 t/ha of fresh fruit was attained with rates of 498 and 394 kg/ha, respectively of N and K2O. In order to reach the maximum fruit size, and to improve the percentage of first class fruit (mass greater than 2.6 kg), were necessary rates of N and K respectively 11 and 43 % higher than those for maximum yield. No effect of P rates was observed on pineapple plant growth, despite the low availability of this nutrient in the soil. The effect of N rates was negative on total soluble solids and total acidity while the opposite occurred with K, which increased also the content of vitamin C. High yield and fruit size were closely related to N and K concentrations in the leaves.
机译：缺乏关于巴西圣保罗州种植的菠萝的施肥信息。因此，对菠萝“ Smooth Cayenne”进行了田间试验，以研究氮磷钾（NPK）速率对产量和果实品质的影响。该试验位于圣保罗州（Agudos县）中部的Alfisol上。实验设计是一个不完整的NPK因子分解，分为两个区块进行32种处理。 P仅在种植时施用，比例为0; 80; 160和320 kg / ha的P2 05（过磷酸盐）。 N和K 2 O比率为0; N和K 2 O比率为0。 175;分别以尿素和氯化钾分别施用350和700千克/公顷，在生长期期间分为四个施用期。调整了响应函数以适应产量或水果特性，以估算达到最大值所需的营养水平。结果表明，氮和钾对产量的二次影响，最大收获量为72吨/公顷，分别为498和394千克/公顷。为了达到最大的果实尺寸，并提高一级果实（质量大于2.6千克）的百分比，必须使N和K的比例分别比最高产量高11％和43％。尽管土壤中这种养分的利用率较低，但未观察到磷肥对菠萝植物生长的影响。氮素含量对总可溶性固形物和总酸度的影响为负，而钾肥则相反，这也增加了维生素C的含量。高产和果实大小与叶片中氮和钾的含量密切相关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号