**Part 3**

**Protected Horticulture** 

60 Horticulture

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**4** 

*Mexico* 

**Total Growth of Tomato Hybrids Under** 

Humberto Rodriguez-Fuentes1, Juan Antonio Vidales-Contreras1, Alejandro Isabel Luna-Maldonado1 and Juan Carlos Rodriguez-Ortiz2

*2Faculty of Agriculture, Autonomous University of San Luis Potosi, San Luis Potosi,* 

Often in intensive production of tomato, the fertilization is applied by the farmers without consider the suitable doses in order to cover nutritional requirements according to crop physiological stages. Thus, appropriate crop management is a strategic demand to maintain or increase tomato production. In spite of many researchers conducted experiments in this subject and data is available about physiological stage requirements for plant nutrition, only few studies have been focused to nutritional parameters. The crop growth curves and nutrient uptake for tomato may determine uptake rate for a particular nutrient eluding possible deficiencies and superfluous fertilizer consumption. The daily rates of nutrient uptake are depending on crop and wheater (Scaife and Bar-Yosef, 1995; Honorato *et al*., 1993; Magnificent *et al*., 1979; Miller *et al*, 1979); however, crop requirements and opportune fertilizer applications, are little known in many of fresh consumption crops. In Mexico, vegetable production is located at desert areas in the north and middle of the country where water shortages have constraints with impact on of water demands the crops of tomato, pepper and cucumber. Thus, the surface for crop production in greenhouses has increased from 350 ha in 1997 (Steta, 1999) to about 5000 ha in 2006 (Fonseca, 2006), because the increasing demand for quality products and the risk of losses on field for crop production. Imas (1999) found that nutrient uptake and fertilization recommendations are conditions depending of crops. For example, tomato crops under hydroponic greenhouse environments have averaged 200 t ha-1 which is significantly higher than the 60-80 t ha-1 yield, typically observed in an open field. In contrast to tomato crops grown in an open field, nutrient uptake in greenhouse environment can be duplicated or triplicated. In practical terms, crop growth cycle is divided according to physiological stages thence different concentrations or amounts of nutrients have to be applied according to recommendations given by Department of Agriculture. In the tomato production are considered four physiological stages: establishment-flowering, flowering-fruit set, ripening of tomato fruit (the first-crop harvest and last harvest on the crop). In each stage concentrations of nitrogen (N) and phosphorus (K) are increasing while nitrogen-phosphorous are decreasing because potassium is uptaken in large quantities during the reproductive stage of the crop (Zaidan

**1. Introduction** 

*1Department of Agricultural and Food Engineering, Faculty of Agriculture,* 

*Autonomous University of Nuevo Leon, Escobedo, Nuevo Leon,* 

**Greenhouse Conditions** 
