ABSTRACT
With randomized block design, a field experiment was conducted in greenhouse to study the effects of combined application of biogas residues and chemical fertilizers on the tomato growth and its fruit yield and quality. The combined application of biogas residues and chemical fertilizers benefited the tomato growth and its fruit yield and quality. The yield of the combined application of 60% biogas residues and 40% chemical fertilizers were higher than the other treatments. The fruit quality under the application of 60% biogas residue and 40% chemical fertilizers also improved significantly, with the Vc content (91.09 mg x kg(-1)) and total sugar content being 21.32 mg x kg(-1) and 2.13% higher than the control, respectively. Among the test fertilization combinations, 60% biogas residue combined with 40% chemical fertilizers was the best one for greenhouse tomato's growth and its fruit yield and quality.
Subject(s)
Fertilizers , Gases/pharmacology , Refuse Disposal/methods , Soil/analysis , Solanum lycopersicum/growth & development , Agriculture/methods , Biomass , Ecosystem , Environment, Controlled , Fruit/growth & development , Solanum lycopersicum/drug effects , Quality ControlABSTRACT
A laboratory incubation experiment was conducted to study the effects of temperature (T), moisture (W), nitrogen application (N), and their combinations on the pH and EC of greenhouse soil having cultivated for 5 years. The results showed that with the increase of incubation time, soil pH was decreasing, which could be well described by the first-order kinetic model, and the pH decreasing rate (k) under effects of test factors was in the order of N > W > W x N > T x W. Soil EC increased quickly to the maxima in the first week of incubation, decreased slightly then, and finally reached to a constant (EC(sty)). The EC(sty) value was significantly affected by N, W, T x W, T, and W x N. Reducing nitrogen application and rational deficit irrigation could effectively postpone the soil acidification and EC increase. A regression equation of k and EC(sty) was established, which could be used to predict the changes of soil pH and EC under different conditions of moisture regime and nitrogen application.
