Method for judging nitrogen nutrition of tomato with nitrate nitrogen concentration of leaf stalk
A tomato nitrogen and nitrate nitrogen technology, applied in the field of tomato cultivation technology management, to reduce costs, prevent groundwater pollution, and improve the efficiency of fertilization operations
Inactive Publication Date: 2014-01-15
SHENYANG AGRI UNIV
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[0004] The technical problem to be solved by the present invention is to propose a method to directly reflect the nitrogen nutritional status of tomato and calculate the optimal topdressing amount according to the determination of the nitrate nitrogen content in the petiole, so as to guide the greenhouse The purpose of tomato top dressing management
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[0027] See figure 1 , 2 , the nitrate nitrogen content of the petiole of the first leaf directly under the first ear of tomato fruit, the normal range is 1000-1200mg / L, nitrogen fertilizer should be applied if it is lower than 1000mg / L, and it is over-nutrition if it is higher than 1200mg / L; The normal range of the nitrate nitrogen content of the petiole of the first leaf directly under the second panicle fruit of tomato is 1200-1400mg / L. If it is lower than 1200mg / L, topdressing nitrogen fertilizer is required, and if it is higher than 1400mg / L, it means excess nutrition. The normal range of the nitrate nitrogen content of the petiole of the first leaf directly under the third ear of tomato fruit is 1400-1600mg / L. If it is lower than 1400mg / L, topdressing nitrogen fertilizer is required, and if it is higher than 1600mg / L, it means excess nutrition. If the measured value of petiole nitrate nitrogen is higher than the normal value range or within the normal value range, no nit...
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The invention provides a method for judging the nitrogen nutrition state of a tomato plant and obtaining an optimal top dressing fertilizer dose by detecting the nitrate nitrogen concentration of the leaf stalk of the tomato plant. The nitrate nitrogen concentration of the leaf stalk of a first leaf under a tomato fruit is tested, and the current nitrogen nutrition level of tomato is determined according to a relation equation of the nitrate nitrogen concentration of the leaf stalk and the top dressing fertilizer dose provided by the invention, so that judgment on the need of dressing a nitrogen fertilizer can be made, and an optimal top dressing fertilizer dose is obtained. Compared with the prior art, the method has the advantages that juice of the leaf stalk of tomato is taken as a test object, so that the phenomena of the interference of the external environmental condition with the conventional method and lag of a prediction result are avoided, measuring indexes are more direct and more reliable, the nitrogen nutrition state of a plant can be judged accurately in time, and very high practicability on the guidance of tomato application management is achieved.
Description
technical field [0001] The invention belongs to the field of tomato cultivation technology management, and specifically relates to a method for judging the nitrogen nutrition state of tomato plants and obtaining the optimum amount of topdressing by detecting the content of nitrate nitrogen in petioles of tomato plants. Background technique [0002] Tomato belongs to Solanaceae and is one of the most widely cultivated and consumed vegetable crops. It is suitable for annual production of facility agriculture. It not only has the characteristics of high yield, long growth period, and large nitrogen demand, but also has the biological characteristics of simultaneous vegetative growth and reproductive growth, that is, the growth of plants and the growth and development of fruits are synchronized. After tomato planting, appropriate topdressing management (mainly nitrogen fertilizer) must be adopted to achieve coordinated vegetative growth and reproductive growth. If topdressing i...
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IPC IPC(8): A01G7/00
Inventor 王蕊须晖马健史自航李天来
Owner SHENYANG AGRI UNIV