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).
Highlights
Juhani Paatela and Hannes HeinrichsRed clover is almost entirely self sterile so that cross pollination is necessary for the development of seeds
Concave, fine-meshed gauze is placed at the head of the capillary tube at the bottom of the broad part of the glass tube. This metal gauze prevents dirt which is loosened in centrifugation from being thrown into the capillary tube, which greatly facilitates the accurate measuring of the height of the nectar column
The paper gives an account of the method to measure the nectar yield of red clover heads
Summary
Red clover is almost entirely self sterile so that cross pollination is necessary for the development of seeds. Than has been paid to the amount of nectar and its variations in corresponding cases [2, 4, 6,7,8,9,10,11,12] This may arise from the lack of a suitable method of measuring the nectar yield. At the University Farm at Viik an attempt was made in 1954to develop the centrifuge method into a simple and quick routine-method This was necessary to make an investigation of a great number of samples possible, and owing to the great variation in the amount of nectar in red clover heads, within each sample which comprised some 20—40 heads. In what follows attention is paid to some of the most important factors affecting the nectar yield and the centrifuge method itself
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