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additions alkaline Ammonium nitrate ammonium nitrogen Ammonium sulfate ball of soil Better Times roses boron Boston yellow daisies bottom calcareous gravel Calcium nitrate Calcium sulfate carboy carnations chemicals chrysanthemums Coarse cinders commercial Comparison of soil concrete CROPS IN GRAVEL culls cent cent deﬁnite feverfew ﬁg ﬁlled with medium ﬁrst ﬁt ﬂat-bottomed bench Flowers ﬂowers per plant ﬂushed gallons gardenias grade Haydite GRAVEL CULTURE growing growth half-tile inches inches inches plant inches plus shorts inlet insigniﬁcant KNO3 longer stems Magnesium sulfate main air line method million of ammonium modiﬁed Monocalcium phosphate nitrate and ammonium nitrogen ORNAMENTAL GREENHOUSE CROPS phosphorus pipe Potassium chloride Potassium nitrate pots pump Purdue roots satisfactory seedlings Selenium signiﬁcant Silica gravel snapdragons Sodium nitrate Soil ball intact Soil ball removed Started eye Stem length sweet peas tables 40 tanks tests tion toxicity valve various media various nutrient solutions WP solution zinc