1 
The number of rainy days was large, but the rainfall was small, 
and the plants in bed No. 1 suffered for want of water. The relative 
harvests for the different beds and crops were as follows: 
Harvest (rela- | | Harvest (rela- 
Plant and bed. eyemumbe): | Plant and bed. bey eet): 
Grain. | Straw. | Grain.| Straw. 
Wheat: | | Barley: 
Tl a ele 100 100 | il pene a Oe oat Rs PE ee ae 100 100 
Ce 2p ee BO Tae ees Sea 132 129 | (ese Ex oat Seeing! SARIN, alee Mae we | 109 105 
i, ESE ee ee ae 72a paar 1642 | law, See leee ee th 216 123 
Rye: | Oats 
Laelia ee a Pe 100 100 AP ere cers se eee Cee ee ees ae 100 100 
Orietas ASE L «072 Wes ee 3 p> | 28 | 136 124 pS a” SERPS: |e ee BS SS REARS ES | 133 116 
Ce Sea ee poe ee ae oe | iil 219 Seed Sees ae oS | 182 | 126 
Beds Nos. 1 and 2 showed about the same rate of growth. No. 3 
showed a retardation. The barley and the rye were harvested from 
this bed four days later than from the other two. The quantity of 
harvest increased with the quantity of water, and the harvest of 
grain, except in the case of the wheat, was more increased by water- 
ing than was the harvest of straw; the quality of the grain showed 
only slight differences. 
Hellriegel experimented (1867-1883) on the influence of water 
upon the crops. He filled a number of vessels with quartz sand and 
maintained the earth at a different state of dryness. The experi- 
ments were repeated for several years on wheat, rye, and oats, the 
general results being that when the ground contained from 60 to 80 
per cent of its full capacity of water the harvest was larger than 
when the ground was drier and about in the following proportions: 
i Wheat crop. Rye crop. | Oat crop. 
Mois- fob S = 
Tub-| ture : 
| oS: | Straw. Grain.|Straw.)Grain. Straw. Grain. 
bese | : 2a 
| Per ct. 
1 | 80-60 22 11.0 16 10° | 16 12 
2 | 60-40 21 10.0 15 10 | 14 11 
3 | 40-20 15 8.0 12 8 | 12 8 
4 | 20-10 ff 2.8 12 4 | 4 2 
» | 
\ 
Hellriegel also varied the experiment by giving the tubs daily, 
each evening, as much water as they had lost during the day, thus 
