Drying problem

sir i grow snakeguord and pumpkin in my rooftop garden.pumpkin in potting mix of soil,cocpeat,compost1:1:1.snakeguord i grow in cocopeat alone .i water them daily in evenings.pumpkin is getting dried though it is alredy flowering and soil has still moisture.sanke guord also flowering briskly but i notice some dryness and changes in leaves.i dont use fertilisers r pesticides.i use homemade hydroponic nutrient solutions mixed in tapwater .i have its ph around5.5-6 and tds 170-200.kindly clarify