Hydroponic culture of tomato with coconut coid dust as substrate, and its response to ammonium and potassium

Plants of tomato (Lycopersicon esculentum Mill.) cv. Celebrity were grown in a hydroponic system type sub-irrigation, under greenhouse conditions, using an organica material derived from milled coconut (Cocos nucifera L.) coir (washed and decanted) as substrate. Three rations of ammonium: 8.3 16.6 and 25.0% of total nitrogen; three rations of potassium: 10, 20 and 30% with respect to total cations; and three levels of dust calcium carbonate mixed with the subtrate (0, 3 and 6 g kg sup-1), were evaluated. The highest fruit and dry matter yields were obtained with 16.6% of ammonium, 30 or 20% of potassium, and 3 or 6 kg sup-1 of calcium carbonate. The coconut coir dust showed a good potential as substrate Plantas de jitomate (Lycopersicon esculentum Mill). var Celebrity, se cultivaron en un sistema hidroponico tipo sub-irrigacion, en condiciones de invernadero, con polvo de bonote de coco (Cocos nucifera L.) lavado y decantado como sustrato. Se compararon tres relaciones de amonio con respecto al nitrogeno total (8.3, 16.6 y 25.50%), tres relaciones de potasio respecto al total de cationes (10, 20 y 30%), y tres niveles de carbonato de calcio en polvo agregados al substrato (0, 3 y 6 kg sup-1). Los mejores rendimiento se obtuvieron con 16.6% de amonio, 30 o 20% de potasio y con 3 o 6 kg sup-1 de carbonato de calcio. El polvo de bonote de coco, tuvo un buen potencial como sustrato