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A controlled-release fertilizer improved soil fertility but not olive tree performance
Nutrient Cycling in Agroecosystems ( IF 2.4 ) Pub Date : 2021-04-09 , DOI: 10.1007/s10705-021-10134-9
Ermelinda Silva , Margarida Arrobas , Alexandre Gonçalves , Sandra Martins , Soraia Raimundo , Luis Pinto , Cátia Brito , José Moutinho-Pereira , Carlos M. Correia , M. Ângelo Rodrigues

The use of a controlled-release fertilizer (CRF) was studied in a traditional rainfed olive grove in a Mediterranean climate where precipitation is very irregular, particularly in the spring. The objective of the study was to assess whether a CRF can improve the olive tree's performance compared to a conventional nitrogen (N) fertilizer (CF), by supplying N gradually and reducing the risk of potential N loss from leaching. The fertilized treatments showed better plant N nutritional status, which resulted in enhanced net photosynthesis and higher leaf concentrations of total soluble sugars, chlorophylls and soluble proteins which, in turn, increased olive yield by 43% in comparison to the unfertilized control. However, in general, no significant differences were found between fertilized treatments in the performance parameters of the trees evaluated, including olive yield. Somewhat unexpectedly, CRF consistently increased the soil organic carbon (C) (29%), kjeldahl-N (75%) and easily extractable glomalin-related soil proteins (EE-GRSP) (60%) and total GRSP (T-GRSP) (122%) compared to the CF. The result was ascribed to a stimulus on the development of herbaceous vegetation and eventually on the activity of the roots of the trees due to the higher soil inorganic-N availability in the autumn. Thus, some soil inorganic-N in the autumn seems to comprise a low risk of leaching, since weeds act as a catch crop and convert this inorganic N into an organic substrate, with potential benefits in the long-term for the agro-system.



中文翻译:

控释肥料可改善土壤肥力,但不能改善橄榄树性能

在地中海地区气候特别是春季降水非常不规则的传统雨养橄榄树林中,研究了控释肥料(CRF)的使用。这项研究的目的是评估CRF是否可以通过逐渐供应N并减少浸出导致潜在的N损失的风险,与常规的N(N)肥料(CF)相比能否改善橄榄树的性能。施肥处理显示出更好的植物氮素营养状况,从而提高了净光合作用,提高了叶片总可溶性糖,叶绿素和可溶性蛋白质的浓度,与未施肥的对照相比,其橄榄产量提高了43%。但是,总的来说,施肥处理之间在评估树木的性能参数(包括橄榄产量)方面没有发现显着差异。出乎意料的是,CRF持续增加了土壤有机碳(C)(29%),凯氏定氮(75%)以及易于提取的与gloomalin相关的土壤蛋白质(EE-GRSP)(60%)和总GRSP(T-GRSP) (122%)与CF相比。其结果是由于秋季土壤无机氮的利用率较高,从而刺激了草本植物的生长,并最终刺激了树木根部的活动。因此,秋季的某些土壤无机氮似乎具有较低的浸出风险,因为杂草可作为一种农作物并将这种无机氮转化为有机底物,从长远来看对农业系统具有潜在的好处。CRF持续增加了土壤有机碳(C)(29%),凯氏定氮(75%)和易提取的gloomalin相关土壤蛋白质(EE-GRSP)(60%)和总GRSP(T-GRSP)(122%) )与CF相比。其结果是由于秋季土壤无机氮的利用率较高,从而刺激了草本植物的生长,并最终刺激了树木根部的活动。因此,秋季的某些土壤无机氮似乎具有较低的浸出风险,因为杂草可作为一种农作物并将这种无机氮转化为有机基质,从长远来看对农业系统具有潜在的好处。CRF持续增加了土壤有机碳(C)(29%),凯氏定氮(75%)和易提取的gloomalin相关土壤蛋白质(EE-GRSP)(60%)和总GRSP(T-GRSP)(122%) )与CF相比。其结果是由于秋季土壤无机氮的利用率较高,从而刺激了草本植物的生长,并最终刺激了树木根部的活动。因此,秋季的某些土壤无机氮似乎具有较低的浸出风险,因为杂草可作为一种农作物并将这种无机氮转化为有机基质,从长远来看对农业系统具有潜在的好处。其结果是由于秋季土壤无机氮的利用率较高,从而刺激了草本植物的生长,并最终刺激了树木根部的活动。因此,秋季的某些土壤无机氮似乎具有较低的浸出风险,因为杂草可作为一种农作物并将这种无机氮转化为有机基质,从长远来看对农业系统具有潜在的好处。其结果是由于秋季土壤无机氮的利用率较高,从而刺激了草本植物的生长,并最终刺激了树木根部的活动。因此,秋季的某些土壤无机氮似乎具有较低的浸出风险,因为杂草可作为一种农作物并将这种无机氮转化为有机基质,从长远来看对农业系统具有潜在的好处。

更新日期:2021-04-09
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