Yellowing of tips of feathers of onions - the phenomenon frequent and each gardener met it, and many times. Yellowing of feathers of this vegetable at the end of season - natural process. However if the yellowness has begun to appear at absolutely young plumelets, then in this case it is necessary to establish as soon as possible the reasons of the events and to eliminate them. Otherwise there is probability to lose the most part of harvest.
Why feather tips at onions turn yellow and as to fight against it
As it has been told above if feathers of onions have begun to turn yellow at the end of season, later few months after landing, in it there is nothing terrible and it is not necessary to fight against this phenomenon, however if the similar beginning to occur at the beginning of summer when feathers have only just reached in height of the maximum, in this case it is important to remove the causes as soon as possible.
In most cases early yellowing of feathers happens because of the shortage of nutrients in the soil, and especially because of the shortage of nitrogen. If long time there is dry weather, then surely water onions, plants can absorb this element only in the dissolved look. Excessively rainy weather also negatively affects onions, in the period of rains nitrogen ""goes"" to base layers of the soil and plant begin to turn yellow from its absence. In this case the only exit - podkarmlivany cultures special nitrogen-containing medicines. Urea, ammonium nitrate, means Kristalin and also infusions of mullein and weeds have not bad proved.
Tips of feathers and because of damage by wreckers can turn yellow. Onions are often attacked by onions moth, onions thrips, onions nematode, however most often - onions fly. To check whether culture is infected by the last of wreckers, tear off yellow feather and break off it lengthways. If you see white larvae, remember that it is onions fly. If feather clean, then take bulb from the earth and probe it: fluidifying in vegetable - sign of defeat by his onions fly. Surely remove the damaged plants from bed that they have not infected the others. After cleaning of sick bulbs surely spill the soil salt water (200 grams of salt on 10 liters of water), repeat the procedure 5-7 days later.
It should be noted that feathers of onions and because of soil zakislennost can turn yellow. Nitrogen is badly acquired in the sour soil and potassium in it very little therefore choose alkaline soil for landing of onions or before each watering spray ashes between ranks, and time in two-three weeks you introduce fertilizers with nitrogen and potassium.