Dynamics of nitrogen availability in pot grown crops with organic fertilization

IF 1.4 4区 农林科学 Q3 AGRONOMY
K. Bergstrand, K. Löfkvist, H. Asp
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引用次数: 16

Abstract

ABSTRACT Pot grown herbs are often cultivated as certified organic products, and there is an increasing demand for organically certified ornamental plants. Supplying the required nutrients using organic fertilizers is a challenge with respect to matching the mineralization and thus the availability of dissolved nutrients in the growing medium with plant demand. In experiments, sweet basil and Pelargonium × hortorum were cultivated using two different organic fertilizer strategies and controlled-release mineral nutrients as control treatment. The two organic strategies were, i) blood meal + Baralith® Enslow (a plant-based organic fertilizer), and ii) poultry manure. The availability of dissolved nitrogen was monitored during the crop cycle by under-pressure lysimeter sampling. Plant development parameters were measured along with chlorophyll fluorescence and chlorophyll concentration of leaves. For both organic treatments, nitrate-N availability was low at the beginning of the experiment, whereas ammonium-N was high. During the experiment, ammonium availability decreased at the same time as nitrate availability increased after a few weeks and then declined again by the end of the experiment. The blood meal + Enslow treatment caused poor germination and slow growth in basil. Plant height and fresh weight was also affected by this treatment for basil but not for Pelargonium. Chlorophyll concentration was affected by treatment, with also visually detectable paler leaves in the treatment with poultry manure. There were no differences in chlorophyll fluorescence (Fv/Fm) between treatments, indicating that plants were not stressed in any of the treatments.
有机施肥对盆栽作物氮素有效性的影响
盆栽草本植物通常作为有机认证产品种植,对有机认证的观赏植物的需求也在不断增加。使用有机肥料提供所需的营养是一个挑战,因为它与矿化相匹配,因此在生长介质中溶解的营养物质的可用性与植物的需求相匹配。本试验以甜罗勒和天竺葵为对照,采用两种不同的有机肥策略和控释的矿质养分进行栽培。两种有机策略为:i)血粉+ Baralith®Enslow(一种植物性有机肥料)和ii)禽粪。采用欠压溶氮仪取样,监测作物生长周期内溶氮的有效性。测定植株发育参数与叶片叶绿素荧光和叶绿素浓度的关系。两种有机处理在试验开始时硝态氮速效较低,而铵态氮速效较高。在试验过程中,铵态氮有效性在数周后随硝态氮有效性的增加而下降,但在试验结束时又再次下降。血粉+缓慢处理导致罗勒发芽差,生长缓慢。对罗勒的株高和鲜重也有影响,对天竺葵没有影响。叶绿素浓度受处理的影响,禽粪处理的叶片也明显变白。叶绿素荧光(Fv/Fm)在不同处理间无显著差异,表明植株未受到胁迫。
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来源期刊
Biological Agriculture & Horticulture
Biological Agriculture & Horticulture 农林科学-农艺学
CiteScore
3.30
自引率
6.70%
发文量
18
审稿时长
>36 weeks
期刊介绍: Biological Agriculture & Horticulture aims to act as the central focus for a wide range of studies into alternative systems of husbandry, and particularly the biological or organic approach to food production. The Journal publishes work of a sound scientific or economic nature related to any aspect of biological husbandry in agriculture, horticulture and forestry in both temperate and tropical conditions, including energy and water utilization, and environmental impact.
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