The present experiment was designed with the objective of evaluating the effect of the Calcium, Boron and Manganese in the decrease or the empting and In the yield of the peanut (Arachis hypogaea) it is an entisol of Morales city; so as to evaluated the benefit and the cost of the best treatments. it was carried out in the Farm oasis. The same one that is In the use to the National University of San Martin- Tarapoto, laking as highway of access the road "Femando Belaunde Terry" Tarapoto­ Moyobamba, going away on the left approximately y 1 Km through !he bridge over Cumbaza river in Morales city it was used, the design or Complete Block Randomized, with 4 treatments and 4 repetitions for each treatment. Of the develops test we reach to the follow conclutions when we have lake advantage of the grains of peanut (1 427 ,47 Kg I Ha) with the treatment one (T1) that corresponds to three appli...