The present study investigated the impact of Helianthus tuberosus + Helianthus annuus and
Helianthus tuberosus + Zea mays L. everta intercropping patterrns in comparison of Helianthus tuberosus
(Jerusalem artichoke) sole crops on Jerusalem artichoke growth, yield components and tuber chemical constituents
under different NPK fertilization rates. The NPK fertilization treatments were four N-P-K rates (0-0-0, 20-20-20,
12-28-0 and 5-5-40 ratio) as foliar spray three times/season. This experiment was conducted as a 5×4 split - plot
arrangement in a randomized complete blocks design with three replications. It was conducted at the Experimental
Farm of Horticulture at El-Kassasein station Research. Ismailia Governorate, Egypt, during two consecutive
summer seasons of 2017 and 2018. Results revealed that intercropping Jerusalem artichoke with sunflower or
popcorn crops mostly gave the lowest values of growth parameters; yield per plant and per feddan as well as
chemical constituents of Jerusalem artichoke compared to sole crop in the two seasons. Also, 20-20-20 of NPK
rate recorded significant increase in these parameters compared to the other rates under study and control. In most
cases, sole Jerusalem artichoke recorded the highest values in tuber yield per plant and per feddan compared to
intercropping systems under all NPK fertilization rates. From competitive indices determination, i.e., land
equivalent ratio (LER), area time equivalent ratio (ATER) and land utilization efficiency (LUE%) revealed that,
applied Jerusalem artichoke + popcorn intercropping pattern was more efficient than sole cropping system and
the other one under study when combined with NPK fertilization at 5-5-40 and 20-20-20 without significant
differences between both rates. Aggressivity (A) estimation indicated that Jerusalem artichoke was dominant
while sunflower or popcorn components were dominated. The interaction treatment between Jerusalem artichoke+
sunflower intercropping pattern and foliar application with N P K at 20- 20 -20 gave the highest values for net
economic return as compared to other treatments in both seasons under Ismailia Governorate conditions.