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首页> 外文期刊>AIMS Agriculture and Food >Nutrient management options for enhancing productivity and profitability of conservation agriculture under on-farm conditions in central highlands of Kenya
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Nutrient management options for enhancing productivity and profitability of conservation agriculture under on-farm conditions in central highlands of Kenya

机译：在肯尼亚中央高地在农场条件下提高保护性农业生产力和盈利能力的营养管理选择

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Decline in soil fertility is one of the major constraints to sustainable crop production and profitability. To meet the increasing demand for the growing population the issue of low soil fertility needs to be addressed. An on-farm experiment was established to evaluate the effect of interaction between NPK fertilizers and minimum tillage on soil fertility, maize crop yield and on farm profit margins. The field trials were set up in a split-plot design organized in a randomized complete block design in 28 farmers’ fields. Application of all the three macronutrients i.e. NPK had the highest and significant (P 0.0001) yields relative to treatments, where any of the three nutrients was omitted. Maize grain yield increased by over 150% with NPK, NP and NK application in all the three cropping seasons over the control. Grain losses with the omission of a single nutrient were highest with N (2.06, 2.40 & 2.42 t hasup?1/sup) followed by P (0.8, 0.59 & 0.43 t hasup?1/sup) in the short rain 2014 (SR2014), long rains 2015 (LR2015) and SR2015 seasons, respectively. Conservation agriculture recorded a significant (P 0.0007) increase in P over the three seasons. There was significantly higher K in the soil within the NP and PK treatments and in the conservation agriculture compared to the conventional agriculture systems. Compared with conventional tillage, the benefit to cost ratio was higher by 3 and 5% under minimum tillage during the LR2015 and SR2015 seasons, respectively. Total variable cost was 4 and 2% higher under conventional tillage compared to minimum tillage during the LR2015 and SR2015 seasons, respectively. Treatments with N and conservation agriculture were the most profitable. A combined use of conservation agriculture and all the three macro-nutrients (NPK) is the best bet for increasing, maize crop yield and associated return on investment.
机译：土壤肥力下降是可持续作物生产和盈利能力的主要制约因素之一。为了满足日益增长的人口需求，需要解决低土壤肥力的问题。建立了一个农场实验，以评估NPK肥料与最低耕作对土壤肥力，玉米作物产量和农业利润率的影响。在28个农民领域的随机完整块设计中组织的分裂图设计中建立了现场试验。应用所有三种Macronuriver的应用相对于治疗具有最高且显着的（P <0.0001）的产率，其中省略了任何三种营养素中的任何一种。玉米籽粒产量增加了150％以上，在控制上的所有三个种植季节中，NPK，NP和NK应用程序增加了150％。 N（2.06,2.40＆2.42 t ha 1 ）随后是p（0.8,0.59＆0.43 t ha 1 ）在2014年短雨（SR2014），2015年长降雨（LR2015）和SR2015季节。保护农业在三个赛季中录得显着的（P <0.0007）增加。与常规农业系统相比，NP和PK治疗中的土壤中的k在土壤中显着提高了k。与常规耕作相比，在LR2015和SR2015赛季的最小耕作中，成本比的益处较高3％和5％。与LR2015和SR2015赛季的最小耕作相比，常规耕作中总变量的总变量为4％，2％。有N和保护农业的治疗是最有利可图的。综合使用保护农业和所有三种宏观营养素（NPK）是对增加，玉米作物产量和相关投资回报的最佳赌注。

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