Management of water and fertilizer of long-term cultivation of tomato (Lycopersicon esculentum) in the solar lean-to greenhouse

Management of water and fertilizer of long-term cultivation of tomato (Lycopersicon esculentum) in the solar lean-to greenhouse

2001

A:PS

Tomato (L. esculentum) cv. Caruso and Liaofenza No. 3 were grown from January to June in 1999 in the "Liaoshen I type" solar lean-to greenhouse in Shenyang, Liaoning, China to investigate fertilizer and water management measures for tomatoes in long-term cultivation. Soil water and nutrients (available P and K, and alkali-hydrolysable N) were determined, and their changes over time analysed. Based on this analysis, management recommendations were made. It is suggested that tomatoes should receive 18-21 irrigations averaging 225-255 m3/ha each time. The total amount of irrigation should be 4384-4866 m3/ha in the whole growth period. Soil water content in the 20 cm soil layer should always be kept at 70-100% of field water-holding capacity. Basal fertilizer applied before transplanting should be 150 t organic fertilizer, 210 kg urea, 375 kg NH4H2PO4 and 375 kg K2SO4/ha. Top dressings should be applied at the fruit setting stage, fruit formation stage, and early and middle stages of harvesting, respectively, with application of 150 kg urea, 225 kg NH4H2PO4 and 225 kg K2SO4 at each stage. Under this management measure, the average rate of fruit setting, average single-fruit weight and total yield of Caruso were 85.1%, 0.171 kg and 16208.7 kg/mu (1 mu = 0.067 ha), and those of Liaofenza No. 3 were 79.3, 0.175 kg and 13499 kg/mu, respectively.

no.6:10-12, CHINA VEGETABLES

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