It is not unusual to find people who predict the rise of alkali almost anywhere except on their own premises. No one can exactly tell where alkali will go, because no one has complete knowledge of the water movement in underlying strata. Wherever the ground water rises on lower levels because of irrigation on higher levels there is danger of the rising of the alkali, for which the only cure is underdrainage with tile so that this rising water is carried to an outflow and not allowed to approach within three or four feet of the surface. If you have such an outflow and desire to undertake the expense of tiling, you can insure yourself against a serious rise of alkali indefinitely. We do not see, however, how alkali can rise to the higher lands of the valley. Its first effect would be to make lakes or ponds in the lowest parts of the valley, and even then the surrounding mesa lands would not be injured. Plants Will Tell About Alkali. Please give information as to the application of gypsum to my soil which is somewhat alkaline. I do not care to have an analysis made of my soil, and believe that you can advise me without it. If your soil is too alkaline for the growth of plants you can demonstrate that fact by experiment, or if it is capable of being used by the application of gypsum, that also can be determined by experiment and noting the behavior of the same plants afterwards. It is rather a slow process but it is sure enough. Litmus and Alkali. Is there any simple soil test for alkali that can be made without a chemical analysis? You can ascertain the presence of alkali by using red litmus paper, which will be turned blue by the alkali in the soil, if the soil is moist enough. This does not determine the amount of alkali, but the quickness of the turning to the blue color and the depth of the color are both attained when the alkali is very strong. When there is less alkali, the reaction is slower and weaker. This test, however, gives you only a rough idea whether the soil is suitable for growing plants. You can tell that better by the appearance of the plants which you find. Any druggist can furnish the litmus paper, and give you a demonstration of how it acts on contact with alkali. Using Gypsum for Alkali. Is it better, to kill the black alkali in the soil with gypsum, just to scatter it over an alkalied spot or to plow the soil first and then use the gypsum? I am going to sow alfalfa. Use the gypsum after plowing, for it will wet down more quickly, and the gypsum has to be dissolved to act freely. The best way to cure your spot is to run an underdrain into it, if possible, so the rain-water can run through the soil freely and take the alkali with it. Blasting or Tiling. In planting trees where hardpan is four feet from the surface is it necessary to blast the hardpan, or is there no benefit derived by the blasting?