Pridelava krompirja z uporabo različnih količin kalijevih gnojil in pršenja z izvlečkov glistin deževnikov (vermi-wash

The use of vermi-wash as organic source and potassium nutrients were investigated under this study. A field experiment was carried out during two successive summer seasons of 2017 and 2018 under open field conditions in Dokki experimental location, Agricultural Research Center, Giza Governorate, Egypt. The study aimed to evaluate the effect of applying different potassium rates 140, 280 and 420 kg K2O per hectare combined with spray vermi-wash for two, four, six times as well as spray water (control) on vegetative growth, yield of potato (Solanum tuberosum ‘Spunta’). The applications of potassium rates and vermi-wash sprays affected significantly the potato vegetative growth, total and marketable tuber yield as well as nutrient contents (N, P and K %) of potato leaves. Increasing potassium rate from 140 to 280 kg K2O per hectare enhanced total yield. Increasing potassium application to 420 kg K2O per hectare led to decrease the vegetative growth and productivity compared to 280 kg K2O per hectare.  Regarding the vermi-wash spray applications, data revealed that two times spray of vermi-wash enhanced vegetative growth and productivity, while increasing spraying of vermi-wash to more than two times led to decrease of potato vegetative growth and productivity.V raziskavi je bila preučevana uporaba vermivoša kot organskega vira in kalijevih gnojil. Poljski poskus je bil izveden v dveh zaporednih poletnih sezonaha, 2017 in 2018 na poskusni postaji v Dokki, Kmetijskega raziskovalnega centra v Gizi, Egypt. Namen raziskave je bil ovrednotiti učinke uporabe različnih odmerkov kalijevih gnojil, 140, 280 in 420 kg K2O ha−1 v kombinaciji z 1-,2-,3-,4- in 6-kratnim pršenjem z vermivošem in pršenjem z vodo kot kontrolo na vegetativno rast in pridelek krompirja (Solanum tuberosum ‘Spunta’). Uporaba odmerkov kalijevih gnojil in pršenje z vermivošem sta značilno vplivala na vegetativno rast kropmpirja, na celokupni in tržni pridelek gomoljev kot tudi na vsebnost hranil (N, P in K %) v listih krompirja. Povečanje odmerka kalija iz 140 na 280 kg K2O ha−1 je povečalo celokupni pridelek. Nadalnje povečanje odmerkov kalija na 420 kg K2O ha−1 je zmanjšalo vegetativno rast in produktivnost v primerjavi z odmerkom 280 kg K2O ha−1. Glede pršenja z vermivošem so rezultati pokazali, da je dvakratno pršenje pospešilo vegetativno rast in produktivnost, več kot dvakratna uporaba pa je oba parametra zmanjšala