nutrient solutions for rubber-tree rootstocks production

This work aimed to evaluate the suspended production of rubber-tree rootstocks with substrate in fertirrigation. Treatments were four types of nutritional solutions in completely randomized experimental design, with 5 repetitions. Fertigation was held every two days, using 200 mL of the solution by container. We evaluated plant height, stem diameter (5 cm above the plant collect), leaf area, number of leaves, dry mass of shoot and of roots, foliar nutrient contents and percentage of plants ready for grafting. The highest values for plant height, number of pairs of leaves, stem, and leaf area of rootstocks were obtained with the highest concentration of nutrients. Foliar nutrient content and percentage of plants ready for grafting were considered adequate by using the maximum fertirrigation dose tested(for 5 L: Ca(NO₃) 2.5g, MgSO4 1.75g; KNO3 1.5g; (NH4)(NO3) 1.0g; NH4H2PO4 0.9g; Zn(NO3)2 0.30g; CuSO4 0.20g; EDTA(Fe+2) 0.15g).