52 



Jouynal of Agricultural Research 



Vol. Ill, Xo. I 



The relative water requirement of the different varieties included in the 

 19 1 3 experiments will be found summarized on the basis of dry matter 

 in Tabic XXX and on the basis of grain production in Table XXXI- 

 Fifty-five species and varieties were included in these measurements. 

 Reference to these tables will show that a number of plants had a higher 

 water requirement than alfalfa, heretofore the most inefficient in the use 

 of water of any plant included in these experiments. On the other hand, 

 millet maintains its supremac)- as the most efficient plant so far included 

 in the water-requirement measurements. 



Table XXX. -Summary of water-rcquiremeyit measurements ai Akron, Colo., in IQIJ, 

 based on dry matter produced 



Crop aiiH variety. 



Botanical name. 



Water require- 

 ment. 



Relative, as 



compared 



with Kubanka 



wheat. 



I9I.3- 



Wheat-grass, western 



Bromc -grass 



Rag\\'eed .western 



Vetch , purjilc 



Flax 



Marigold, fetid 



Pumpkin 



Alfalfa, Grimm 



Soy bean, wild 



Clover, crimson 



I.amb's-quarters 



Clover, red 



Bean, horse, S. P. I. 15429. . . 



Pea, Canada field 



Sunflower, narrow leaved . . . 



Bean, Mexican 



Bean, horse, S. P. I. 25645 



Squash 



Rice, Honduras 



Rape 



Potato, McConnick 



Cucumber 



Sunflower, annual 



Wheat-grass 



Vetch, hairy 



Bean, navy 



Bean, soy, cultivated 



Potato, Irish Cobbler 



Cotton, Triumph 



Alfalfa, Peruvian 



Turnip 



Cantaloupe 



Oat: 



Swedish Select 



Burt 



Watermelon 



Cowpea 



Sunflower, narrow-1 e a v e d , 

 from sand hills. 



Cabbage 



Wheat, Kubanka 



Cocklebur 



Agropyron Smithii 



Bromus inermis 



Ambrosia arteraisifolia . 

 Vicia atropurpurea . . . . 

 Linum usatissimum. .. . 



Boebera papposa 



Cucurbita pepo 



Medicago sativa 



Glycine soja 



Trifolium incamatum . . 

 Chenopodium album. .. 



Trifolium repens 



Vicia faba 



Pisum sativum 



Helianthus petiolaris. . 

 Phaseolus vulgaris. . . . 



Vicia faba 



Cucurbita maxima. . . . 



Orj'za sativa 



Brassica napus 



Solanum tuberosum . . . 



Cucumbis sativa 



Helianthus annuus. .. . 

 Agropyron cristatum. . , 



Vicia villosa 



Phaseolus vulgaris . . . . 



Glycine hispida 



Solanum tuberosum . . . 

 Gossypium hirsutum . . 



Medicago sativa 



Brassica rapa 



Cucumis melo 



Avena sativa 



do 



CitruUus vulgaris 



Vigna sinensis 



Helianthus petiolaris . 



Brassica oleracea capitata, 



Triticum durum 



Xanthium commune 



i,076±29 

 I, oi6±26 

 948 ±66 

 93S±9 

 905^25 

 881 ±26 



834±i7 

 834±S 

 8i5±25 

 805 ±8 

 801 ±41 



789 ±9 

 78o±i9 



775 ±5 

 774±2o 

 773±8 

 772±ii 

 748 d= 8 

 744±i7 

 743 ±7 

 7i7±ii 



7i3±ii 

 705 ±8 

 70S±27 

 600 ±8 

 682 ±4 

 672±9 



6S9±i5 

 6s7±ii 

 65i±i2 

 639^31 



62I±27 



6i7±9 

 6i7±5 

 6oo±i5 



571 ±3 

 570±ii 



539 ±7 

 496 ±5 

 432 ± 13 



i7±o. 06 

 io± . 06 



i.9i± 

 i.89± 



I. 82± 



I. 78± 

 i.68± 

 i.68± 

 I. 64± 



I.62± 

 I. 62± 



i-59± 

 '•57± 

 I. 56± . 02 

 I. 56± . 04 

 I. 56± . 02 

 I. 56± .03 

 I. 51 ± .02 

 I. 5o± . 04 

 I. 5o± . 02 

 i-45± -03 

 I. 44± -03 

 I. 42± . 02 

 I. 41 ± 

 i-39± 

 i-38± 

 i-35± 



^■33± 

 i-3i± 



I. 29± 

 I. 2S± 



13 

 °3 

 °S 

 06 



04 

 02 



°S 

 02 

 08 

 02 

 04 



06 

 02 

 02 

 02 

 °3 

 03 

 03 

 06 

 06 



I. 24± . 02 



I. 24± . 02 

 I. 2I± .03 



1. 15± .01 

 1. 15± .03 



i.o9± 

 I. 00 



.87± 



°3 



