Abstract
The paper gives an account of the method to measure the nectar yield of red clover heads. The method was developed at the University Farm at Viik in 1954, and based on two centrifugation methods employed earlier. The main attention was paid to the taking of the sample and its fast handling, because the heterogeneous nature of the material demands even in the case of one sample the examination of a considerably large number of heads. The secretion of nectar and sugar was more abundant in the large heads than in the small-sized ones so that for the obtaining of realiable data with a moderate number of heads the sample should be composed of heads of as near the same size (medium size) as possible. The shortening of the corollas by cutting before centrifugation proved unnecessary at least where sufficiently large glass tubes were employed. By changing the method of fastening the inflorescences and the form of the glass tube, and by inserting a metal gauze at the bottom of the capillary tube the clean nectar was easily directed into the capillary tube (Figs. 1 and 2).
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Claims 4
Claim · model-written summary
Large red clover heads secreted more nectar and sugar than small heads.
- Taxon
- red clover
Trifolium pratenset0 - Organ / stage
- headse0
- Outcome
- secretion of nectar and sugare0
- Direction
- more abundante0
- Comparator
- small-sized onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The secretion of nectar and sugar was more abundant in the large heads than in the small-sized ones”
t0“red clover heads”
Claim · model-written summary
Medium-sized heads were recommended for samples to obtain reliable data with moderate sample size.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- sample should be composed of heads of as near the same size (medium size) as possiblee0
- Qualifier
- with a moderate number of headse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the obtaining of realiable data with a moderate number of heads the sample should be composed of heads of as near the same size (medium size) as possible.”
t0“red clover heads”
Claim · model-written summary
Cutting corollas before centrifugation was unnecessary with sufficiently large glass tubes.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- shortening of the corollas by cutting before centrifugation proved unnecessarye0
- Comparator
- sufficiently large glass tubese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shortening of the corollas by cutting before centrifugation proved unnecessary at least where sufficiently large glass tubes were employed.”
t0“red clover heads”
Claim · model-written summary
The modified fastening, glass tube and gauze directed clean nectar into the capillary tube.
- Taxon
- red cloverTrifolium pratenset0
- Treatment
- changing the method of fastening the inflorescences and the form of the glass tube, and by inserting a metal gauze at the bottom of the capillary tubee0
- Outcome
- clean nectar was easily directed into the capillary tubee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By changing the method of fastening the inflorescences and the form of the glass tube, and by inserting a metal gauze at the bottom of the capillary tube the clean nectar was easily directed into the capillary tube”
t0“red clover heads”