Abstract
Tetranychus urticae was reared on the leaves of one year old apple rootstocks grown on eight different nutrient solutions in gravel culture. The N‐content of the apple leaves derived from plants growing on the different nutrient solutions showed a strong variation during the experimental period which was independent of the NO 3 − level of the nutrient solutions. The ranges in N‐content at each moment were small in comparison with the range during the whole experiment. An increase in the total nitrogen content in the leaves resulted in an increase in the egg production of the mites. Differences in the K+/Mg+ + ratio in the nutrient solutions were not correlated with mite reproduction on the plants grown on these solutions. No significant difference was found in the water content of the leaves of apple plants on the eight nutrient solutions. The shootlength of the plants grown in a nutrient solution with a high NO 3 − concentration and a high Mg+ +/K+ ratio was much greater than the shootlength of the plants grown in a solution with a low NO 3 − concentration and a low Mg+ +/K+ ratio. There was a slight tendency towards higher egg‐production on the younger expanded leaves than on older leaves. The mean number of production days per female was significantly higher on young and full‐grown leaves than on old leaves. The longevity of the mites reared on leaves with a high N‐content was greater than on leaves with a low N‐content. RÉSUMÉ OBSERVATIONS SUR LE RAPPORT ENTRE LA NUTRITION MINÉRALE DE POMMIERS CULTIVÉS SUR UN SUBSTRAT DE GRAVIER ET LA FÉCONDITÉ DE TETRANYCHUS URTICAE (ACARINA: TETRANYCHIDAE) L'araignée rouge ( Tetranychus urticae ) a été élevée sur pommiers âgés d'un an, alimentés avec des solutions nutritives ioniquement équilibrées. Les plantes sont cultivées sur un substrat de gravier. Les résultats obtenus au cours de ces expériences sont les suivants: La teneur en N des feuilles provenant des plantes cultivées sur les huit solutions nutritives présente une variation très grande pendant la durée de l'expérience, variation qui est indépendante de la teneur en NO 3 − des solutions nutritives. La variation des teneurs en N des feuilles des échantillonnages individuelles était plus petite que celle observée pour l'ensemble de l'expérience. Un excès de N dans les feuilles augmente la fécondité des acariens. Le rapport de K+/Mg+ + dans les solutions nutritives n'avait pas d'influence sur la fécondité des acariens. Les feuilles des plantes cultivées sur les huit solutions nutritives différentes ne montraient pas une différence significative quant à la teneur en eau. La longueur des pousses des plantes augmente lorsque l'azote et le magnésium sont fournis en excès à la plante‐hôte. La fécondité des acariens augmente, bien que non significativement, lorsqu'ils sont élevés sur des feuilles jeunes. Le nombre de jours productifs, par femelle, était plus élevé sur des feuilles jeunes que sur des feuilles vieillies. La durée de vie des acariens augmente lorsqu'ils sont élevés sur des feuilles à teneur élevée en azote.
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Claims 10
Claim · model-written summary
Apple leaf nitrogen varied strongly during the experiment.
- Taxon
- apple
Malus domesticae0 - Outcome
- N‐content of the apple leavese0
- Direction
- strong variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N‐content of the apple leaves derived from plants growing on the different nutrient solutions showed a strong variation during the experimental period”
Claim · model-written summary
Apple leaf nitrogen variation was independent of solution nitrate.
- Taxon
- APPLEMalus domesticat0
- Treatment
- NO 3 − levele0
- Outcome
- N‐content of the apple leavese0
- Direction
- independente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“The N‐content of the apple leaves derived from plants growing on the different nutrient solutions showed a strong variation during the experimental period which was independent of the NO 3 − level of the nutrient solutions.”
Claim · model-written summary
Leaf nitrogen range at each time was small compared with the full experiment.
- Taxon
- APPLEMalus domesticat0
- Outcome
- ranges in N‐contente0
- Direction
- smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“The ranges in N‐content at each moment were small in comparison with the range during the whole experiment.”
Claim · model-written summary
Higher apple leaf nitrogen increased mite egg production.
- Taxon
- APPLEMalus domesticat0
- Organ / stage
- leavese0
- Outcome
- egg production of the mitese0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“An increase in the total nitrogen content in the leaves resulted in an increase in the egg production of the mites.”
Claim · model-written summary
Nutrient solution K/Mg ratio did not correlate with mite reproduction.
- Taxon
- APPLEMalus domesticat0
- Treatment
- K+/Mg+ + ratio in the nutrient solutionse0
- Outcome
- mite reproductione0
- Direction
- not correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“Differences in the K+/Mg+ + ratio in the nutrient solutions were not correlated with mite reproduction on the plants grown on these solutions.”
Claim · model-written summary
Leaf water content did not differ significantly among nutrient solutions.
- Taxon
- appleMalus domesticae0
- Treatment
- eight nutrient solutionse0
- Outcome
- water content of the leavese0
- Direction
- No significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“No significant difference was found in the water content of the leaves of apple plants on the eight nutrient solutions.”
Claim · model-written summary
High nitrate and Mg/K produced longer apple shoots than low levels.
- Taxon
- APPLEMalus domesticat0
- Treatment
- a high NO 3 − concentration and a high Mg+ +/K+ ratioe0
- Outcome
- shootlengthe0
- Direction
- much greatere0
- Comparator
- a low NO 3 − concentration and a low Mg+ +/K+ ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“The shootlength of the plants grown in a nutrient solution with a high NO 3 − concentration and a high Mg+ +/K+ ratio was much greater than the shootlength of the plants grown in a solution with a low NO 3 − concentration and a low Mg+ +/K+ ratio.”
Claim · model-written summary
Mite egg production tended to be higher on younger expanded leaves.
- Taxon
- APPLEMalus domesticat0
- Organ / stage
- younger expanded leavese0
- Outcome
- egg‐productione0
- Direction
- highere0
- Comparator
- older leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“There was a slight tendency towards higher egg‐production on the younger expanded leaves than on older leaves.”
Claim · model-written summary
Mite production days per female were significantly higher on young and full-grown leaves than old leaves.
- Taxon
- APPLEMalus domesticat0
- Organ / stage
- young and full‐grown leavese0
- Outcome
- number of production days per femalee0
- Direction
- highere0
- Comparator
- old leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“The mean number of production days per female was significantly higher on young and full‐grown leaves than on old leaves.”
Claim · model-written summary
Mites lived longer on high nitrogen leaves.
- Taxon
- APPLEMalus domesticat0
- Organ / stage
- leavese0
- Outcome
- longevity of the mitese0
- Direction
- greatere0
- Comparator
- leaves with a low N‐contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“APPLE”
e0“The longevity of the mites reared on leaves with a high N‐content was greater than on leaves with a low N‐content.”
The same questions in other papers
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2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.