. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . may result in thechange of practically all the nitrates in the soil to ammoniacompounds. It is further shown that while some plants,such as rice for example, prefer their nitrogen in the form ofammonia compounds, that such compounds are actually 1 Joiir. Agr. Research, Vol. II, No. 2, pp. 101-113. 2 The Poor Nitrifying Power of Soils a Possible Cause ofDie-Back in Lemons. Science, n. s., Vol. XXXIX, No. 1011,May 15, 1914. 380 Fruits poisonou
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . may result in thechange of practically all the nitrates in the soil to ammoniacompounds. It is further shown that while some plants,such as rice for example, prefer their nitrogen in the form ofammonia compounds, that such compounds are actually 1 Joiir. Agr. Research, Vol. II, No. 2, pp. 101-113. 2 The Poor Nitrifying Power of Soils a Possible Cause ofDie-Back in Lemons. Science, n. s., Vol. XXXIX, No. 1011,May 15, 1914. 380 Fruits poisonous to citrus trees, which show a decided preferencefor nitrates. With the condition in the soil favoring slownitrification and rapid ammonification the trees are forcedto take ammonia compounds or go without nitrogen entirely,as in many California soils the ammonia resulting from thedecomposition of organic matter is actually set free in the airand lost entirely. Experiments are now being performedin the hope of finding a practicable method of treatingorchard soils which may accelerate nitrification and atthe same time retard Spot on old lemon loaf due to withcr-tip. Withcr-tlp (CoUdotrichum gloeosporioidcs) This disease is said to be quite common in Florida andespecially on limes in Cuba, causing a spotting of the oldfruit and leaves, killing back the twigs, and causing the youngnewly set fruit to drop ofp.^ In California, however, it ap- A recent investigation at the University of California hasshown that in Cuba and Florida, two distinct diseases have beenconfused. The killing and deforming of young foliage and fruitsof the Hme are due to a fungus which somewhat resembles Colleto-trichum gloeosporioides but is entirely distinct from it. This Disca,sfs and their Control ;i81 pears to be of little practical importance, for although thefungus has long been present in abundance throughout thecitrus growing areas, it very rarely attacks healthy treesas an active p
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcitrusfruits, bookyea
