Evaluation of Site-Specific Fertilizer Recommendation for Cauliflower (Brassica oleracea L.) in two Locations in Sri Lanka
Evaluation of Site-Specific Fertilizer Recommendation for Cauliflower (Brassica oleracea L.) in two Locations in Sri Lanka
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斯里兰卡两个地点花椰菜 (Brassica oleracea L.) 特定地点施肥建议的评估
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
F. Sultanbava
中科院分区：
文献类型：
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作者：
J. P. Kirthisinghe;D. Kumaragamage;F. Sultanbava
矿物质营养素供应不足和不平衡可能是斯里兰卡蔬菜产量较低的原因之一。定点施肥管理是一种现代化的方法，可以提高肥料利用效率，最大限度地减少对环境的影响。本研究旨在评估使用系统的方法诊断土壤养分问题，以改善目前花椰菜施肥建议的潜力。采用三步提取法分析了从斯里兰卡多丹戈拉和佩尔韦赫拉两个实验地点收集的土壤中的有效养分。养分含量进行了比较，确定的最佳值，以确定不足之处。对P、K、Cu、Zn、Fe、Mn、S和B进行的固定研究用于调整要补充的肥料量。在温室中使用改良的缺失元素技术，使用高粱（Sorvulgare Pers），并在田间使用花椰菜（Brassica oleracea L.），对每种土壤制定的最佳肥料推荐进行了测试。作为试验作物。采用随机完全区组设计，进行了连续四季的田间试验，比较了最佳处理与农业部（DOA）推荐的其他处理以及不同N、P、K中、微量营养素组合的处理。土壤分析表明，缺乏水平的N，P，K在这两个位置，和钙，S，B，Mn，Mo在Dodangolla。最佳处理在温室中获得了最高的干物质产量，而氮、磷和钾的负处理产量显着较低，证实了土壤测试预测的缺陷。最佳施肥处理的平均花椰菜凝乳产量在129.8 - 263.7 g/株（5.19 - 10.55 mt/ha）之间，显著高于其他施肥处理。在Pelwehera和Dodangolla连续四个季节的花椰菜田间试验结果表明，最佳处理优于其他肥料组合，在获得更高的产量。效益成本比分析证实，最佳的肥料处理是更有利可图的，因为它给了最高的总回报高于肥料成本（GRF）比DOA或任何其他肥料处理。
Inadequate and unbalanced supply of mineral nutrients may be one reason for the lower yields of vegetables in Sri Lanka. Site-specific fertilizer management is a modern approach that could increase the fertilizer use efficiency with minimum environmental impacts. This research was conducted to evaluate the potential of using a systematic approach of diagnosing soil nutrient problems in improving the present fertilizer recommendation for cauliflower. Soils collected from the two experimental sites at Dodangolla and Pelwehera, Sri Lanka were analysed for available nutrients using a three- step extraction method. Nutrient contents were compared with the established optimum values to identify deficiencies. Fixation studies conducted for P, K, Cu, Zn, Fe, Mn, S and B were used to adjust the amount of fertilizer to be supplemented. An optimum fertilizer recommendation formulated for each soil was tested in the greenhouse using a modified missing element technique using sorghum (Sorghum vulgare Pers), and in the field using cauliflower (Brassica oleracea L.) as the test crop. Field experiments were conducted for four consecutive seasons comparing the optimum treatment with other treatments including the Department of Agriculture (DOA) recommendation, and treatments with different combination of N, P, K secondary and micronutrients using a Randomized Complete Block Design. Soil analysis indicated deficient levels of N, P, K in both locations, and Ca, S, B, Mn, Mo at Dodangolla. The optimum treatment gave the highest dry matter yield in the greenhouse while the minus treatments of N, P, and K gave significantly lower yields, confirming the deficiencies predicted by soil testing. The average cauliflower curd yield in the field varied between 129.8 - 263.7 g/plant (5.19 - 10.55 mt/ha) with the optimum treatment, which was significantly higher than the other corresponding fertilizer treatments. The results of field experiments with cauliflower at both Pelwehera and Dodangolla, for four consecutive seasons indicated the superiority of the optimum treatment over other fertilizer combinations in obtaining higher yields. Benefit cost ratio analysis confirmed that the optimum fertiliser treatment is more profitable as it gave the highest gross return above fertilizer cost (GRF) than the DOA or any other fertiliser treatment.