July 22 ,1918 Salt Requirements for Buckwheat Plants 157 
The relative yield of values of tops, roots, and seeds were plotted on 
triangular diagrams like those previously employed (7), and to which 
reference is made above. These diagrams represent graphically the 
distribution of the dry-weight yields taken directly from the proper 
column of averages in Table I. To facilitate the study of this distri¬ 
bution and to aid in making comparisons, the total range of yield values 
in The average series is divided into an upper one-fourth, comprising 
the nine cultures which produced the highest yields, a lower one-fourth, 
including the nine cultures giving the lowest yields, and a medium one- 
half, which includes the remaining cultures. These three partial ranges 
were outlined on the triangular diagrams to correspond to the regions of 
high, low, and medium yields. The areas of high yields (range of the 
best nine cultures) are indicated on the diagrams by small crosses, and 
the areas of low yields (range of the poorest nine cultures) are denoted 
by small circles. The position on the diagram of the culture giving the 
highest yield is shown by a larger cross, and that of the culture giving 
the lowest yield is indicated by a larger circle. 
B.—Comparison of Results Obtained from Cultures Grown to Maturity 
With Those Obtained from Cultures Grown to the Flowering Stage 
(1) dry weights of tops 
For the sake of convenience in the discussion, the culture series 
grown to the flowering stage (early developmental period) in the optimal 
series of 3-salt solutions comprising the 36 different sets of salt propor¬ 
tions, will be referred to as series A, while those conducted in the same 
series of solutions from the flowering stage to the maturity of the seed 
(late developmental period) will be designated as series B. The relative 
dry-weight data for these two average series are brought together in 
Table II. The second and third columns of this table present the average 
relative dry-weight values of tops and of roots for the various cultures of 
series A. In the fourth and fifth columns are given the corresponding 
data for series B. The actual dry weight, in grams, of culture R1C1 
is given in parentheses directly below the relative value, so that the 
actual dry-weight value of any culture may be found by multiplying its 
relative value by the actual value of culture R1C1 in the same column. 
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