Studies On Growth And Modeling With Proportionally Fertilized Strawberry In Pot

The strawberry cultivar Darselect in trial was introduced from France for the first time in 1997. This variety is considered as mid-prematurity, robust crop.Its adaptability appears very strong with a high resistance to various pests and diseases. The fruit shows a standard cone shape, scarlet with high brightness, the flesh is all-red, firm, bearing carrity, the fruit taste is very good with adequate proportion of acid and sugar, Total soluble sugar (TSS) varies from 9 to 12 %. The fruit weight from the first blossom ranges from 26 g to 65 g, with a yield up to 2000-3500 kg/667m2. Strawberry cultivated in pot by soilless and proportional fertilization can provide a longer flowering and fruiting period as an ornamental plant in city. Its cultivation in pot also brings to an important potential recreative consumption and increases its additional value.The strawberry blossom and fruit bearing are important. The flower period generally meets a large need of nutrients. Nowadays, strawberry cultivation depends principally on fertilization, particularly on application of combined mineral elements. Improper fertilization results in lower fruit quality and yield, even environmental deterioration in ecosystem. Along with the modernization of strawberry intensive cultivation, it is necessary to develop a modern sustaining-agriculture and improve the ecosystem environment quality in order to obtain ecological-econom-social benefits. So that the proper fertilization is thought as an scientific and economic practice in strawberry cultivation, especially in application of proportionally combined N, P, K elements.The trial is carried out through the new firm-flesh cultivar cultivation ofstrawberry (Fragavia ananessa: F. chiloensisXF. Virginia) introduced from France (Darselect: ParkerXElsanta) planted in pot. With fifteen different combinations or treatments of N, P and K, the vegetative and reproductive characteristics were observed. The result indicated that treatment 9 was the optimal one with the highest yield among the total 15 treatments as compared with a non-fertilized check. The best treatment was made up of N: P: K=0.112:0.07:0.45 g/l, or proportion 1: 0.7: 4.5.The experiment result was presented by a correlation matrix of the vegetative growth and reproductive growth index, among which the vegetative index are related closely to the reproductive ones, only when the two growth metabolism attain a better coordination, the cultivar characteristic could be shown. In this experiment the most beneficial treatment for the growth could be regarded as the treatment 9 (high N, middle P, middle K). In conclusion, the treatment 9 attained the better balance of vegetative and reproductive growth, got the highest yield in this experiment. The ratio of the three macro-elements plays an important role in the growth and development of the strawberry plant.This experiment establishes the nutritious effect model for each growth variable through the combined fertilization of N, P, K, by which we can analyse the influence of the three main elements on the growth and the yield of the strawberry. The plant reaction to N, P, K could be presented by three-factor quadratic regression model. However, the parameters in the model might be influenced by climate, cultivar as well as soil factors. It proved to be necessary to bring to a further research. Most of the simulated mathematic model is typical parabola. Therefore, applying more fertilizer does not mean more beneficial to strawberry growth. Our experiment indicates that: Under the current production condition and the varietal characteristics, the most suitable usage of fertilizer is high level in N and the middle level in P2O5and K2O with the best growth. That is, N influences directly the growth and fruiting, when the other elements have no significant effects. N determines in some great degree whether the carbohydrate is used to vegetative growth or reproductive growth.