Abstract
<h2>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 K<sub>2</sub>O per hectare combined with spray vermi-wash for two, four, six times as well as spray water (control) on vegetative growth, yield of potato (<em>Solanum tuberosum</em> ‘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 K<sub>2</sub>O per hectare enhanced total yield. Increasing potassium application to 420 kg K<sub>2</sub>O per hectare led to decrease the vegetative growth and productivity compared to 280 kg K<sub>2</sub>O 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.</h2>
Highlights
Potato is one of the most important foods and cash crops cultivated worldwide under a wide range of climatic condition
The objective of this study is to determine the effects of different potassium rates and application of vermi-wash on growth and yield of potato
Increasing K level led to the increase of potato vegetative growth up to 280 kg K2O per hectare
Summary
Potato is one of the most important foods and cash crops cultivated worldwide under a wide range of climatic condition. At present it is the fourth most important food crop in terms of its production in the world, after wheat, rice and maize FAO (2008). It is a source of both food and income in many of the densely populated areas. The size of tubers depends on the application of potassium fertilizers due to the function of K in plants. In a sery of experiments it was indicated that tuber yields were smaller in soils with small K reserves compared to soils with larger K reserves irrespective of the amount of K fertilizer applied (Gunadi, 2009)
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