· 1n order to increasing the yield and productivity of the corn yellow hard low conditions of tropical humid forest, it was opted to carry out the present investigation work where was evaluated the effect of the application of vegetable hormones and micronutrients (boron and molybdenum) in the one filled of the ear of corn, comparing with a witness and to demonstrate that application ( dose) they are those but favorable 1 lower these conditions to produce high yields. The work was executed in the district of Sallow, county and region from San Martín to 52 Km. of the city of Tarapoto. the objectives of this work were to evaluate the alone applied effect of vegetable hormones and in mixture with micronutrients (8 and Mo), the most appropriate dose for the one filled of the ear of corn and to determine the treatment that produces high yields and to determine the relationship cost-benefit ...