Effects of fertilization levels in two farming systems on senescence and nutrient contents in potato leaves

Berchtold, A; Besson, JM; Feller, Urs (1993). Effects of fertilization levels in two farming systems on senescence and nutrient contents in potato leaves. Plant and Soil, 154(1), pp. 81-88. Springer 10.1007/BF00011075

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The influence of fertilization on senescence and nutrient remobilization in potato leaves was investigated in two farming systems on a soil with a poor potassium availability. The `Conventional' farming system followed good local practices including industrial products, while in the `Bio-Dynamic' farming system industrial fertilizers and synthetic pesticides were avoided. Potassium concentrations in the dry matter of mature leaves varied over a wide range. Nitrogen compounds (protein, chlorophyll) were less affected, and phosphorus concentrations in the dry matter were similar. Magnesium and potassium concentrations in the leaves were negatively correlated. In both farming systems senescence was advanced in plants with a low nutrient supply. Alkaline pyrophosphatase and aminopeptidase activities (in general highest in expanding and mature leaves) were lower and endopeptidase activities peaked earlier on plots with low fertilizer levels. A high percentage of potassium was remobilized from senescing leaves on unfertilized plots, but the phosphorus concentration remained high at the end of the season. The results suggest that the differential net remobilization of nitrogen, phosphorus and potassium depended on actual source/sink relations in the plants.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition [discontinued]
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Feller, Urs

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0032-079X

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

05 Jul 2017 08:56

Last Modified:

05 Jul 2017 08:56

Publisher DOI:

10.1007/BF00011075

Additional Information:

8TH INTERNATIONAL COLLOQUIUM FOR THE OPTIMIZATION OF PLANT NUTRITION, LISBON, PORTUGAL, AUG 31-SEP 08, 1992

Uncontrolled Keywords:

farming system, fertilization, magnesium, nitrogen, potassium, potato, proteolytic enzymes, senescence, Solanum tuberosum L.

BORIS DOI:

10.7892/boris.91899

URI:

https://boris.unibe.ch/id/eprint/91899

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