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A method for diagnosing nitrogen nutrition in drip irrigation corn and recommending topdressing nitrogen

A technology for corn nitrogen and nutrition diagnosis, applied in fertilization methods, fertilization devices, applications, etc., can solve the problems of lack of quantitative standards for nitrogen fertilizer topdressing, difficulty in obtaining the best fertilization effect, poor operability for producers, etc. The effect of convenience, avoidance of interference, and simple measurement means

Inactive Publication Date: 2016-08-24
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in drip irrigation corn production, there is no quantitative standard for the topdressing amount of nitrogen fertilizer at each stage. For producers, the operability is poor, and it is difficult to obtain the best fertilization effect

Method used

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  • A method for diagnosing nitrogen nutrition in drip irrigation corn and recommending topdressing nitrogen
  • A method for diagnosing nitrogen nutrition in drip irrigation corn and recommending topdressing nitrogen

Examples

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Embodiment 1

[0035] Example 1: Jointing stage, drip irrigation maize nitrogen nutrition diagnosis method and topdressing recommendation 1. Sampling: The soil fertility is moderately low, and the planting density is 105,000 plants / hm 2 In the drip irrigation corn field, 5 corn plants with uniform growth were randomly selected, and samples were taken at 10-12 o'clock in the morning. The uppermost part of each corn plant was cut off with sterilized scissors and the leaf sheath was completely flattened, cleaned with deionized water, and wiped with absorbent paper. Dry it, then cut it into 0.5cm pieces with sterilized scissors, and set aside;

[0036] 2. Sample processing: Use a micro juicer to extract the juice from the spare sample in step 1, then transfer the extracted juice into a 2mL centrifuge tube with a straw, and then use a micropipette to pipette 0.1ml of the sample solution into a 5ml centrifuge tube. Dilute 10 times with distilled water for later use;

[0037] 3. Detection: Immerse...

Embodiment 2

[0040] Example 2: Diagnosis method of nitrogen nutrition and recommendation of topdressing in drip irrigation maize during tasseling and silking

[0041] 1, sampling: the difference with embodiment 1 is only to cut off the leaf sheath of every ear of corn with sterilized scissors;

[0042] 2, sample processing: same as embodiment 1;

[0043] 3, detection: same as embodiment 1;

[0044] 4. Diagnosis of plant nitrogen nutrition status: compare the average value of nitrate concentration measured in step 3 with the critical concentration value of nitrate in the silking stage of tasseling to diagnose the nitrogen nutrition status of plants: the measured value of nitrate concentration is lower than that of tasseling When the critical concentration of nitrate in the silk stage is 583.01 mg / L, topdressing with nitrogen fertilizer is required;

[0045] 5. The principle is the same as in Example 1. After step 4 judges, if the measured nitrate concentration average value is lower than ...

Embodiment 3

[0046] Embodiment 3: Diagnosis method of nitrogen nutrition in drip irrigation corn during grain filling stage

[0047] 1, sampling: the difference with embodiment 1 is only to cut off the corn ear position leaf sheath after every plant corn tasseling with sterilized scissors;

[0048] 2, sample processing: same as embodiment 1;

[0049] 3, detection: same as embodiment 1;

[0050] 4. Judgment of plant nitrogen nutrition status: compare the average nitrate concentration measured in step 3 with the critical concentration value of nitrate during the filling period to diagnose the nitrogen nutrition status of the plant: the measured value of nitrate concentration is lower than that of nitrate during the filling period If the critical concentration is 92.71mg / L, topdressing with nitrogen fertilizer is required;

[0051] 5. The principle is the same as in Example 1. After step 4 judges, if the average value of the measured nitrate concentration is lower than the critical concentr...

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Abstract

The invention relates to a drip-irrigation corn nitrogen nutrient diagnosis and nitrogen topdressing recommending method, which comprises the following steps: determining the concentration of nitrate on drip-irrigation corn function leaf sheaths by applying a nitrate test strip-reflectometer method, judging the nitrogen nutrition status of corn plants according to the critical index of the nitrate concentration of the plants, and finally recommending optimal nitrogen topdressing quantity according to the linear relationship of plant nitrate concentrations in growth stages and nitrogen applying levels, and a nitrogen fertilizer topdressing model. By adopting plant function leaves as testing objects, the interference of the traditional method from the outside environment conditions and the lagging of predicted results can be avoided, the measurement index is more direct and reliable, the nitrogen nutrition status of corn plants can be timely and accurately judged, the measurement means are simpler, the carrying is convenient, and the drip-irrigation corn nitrogen nutrient diagnosis and recommended nitrogen topdressing method is especially suitable for field operation and base level work, and has good application prospects on guidance on the high-yield drip-irrigation corn nitrogen fertilizer topdressing under high-density planting mode.

Description

technical field [0001] The invention relates to a method for diagnosing nitrogen nutrition in drip irrigation corn and recommending nitrogen topdressing, in particular to a method for diagnosing nitrogen nutrition in drip irrigation corn and recommending nitrogen topdressing under a high-density planting mode based on plant nitrate concentration. Background technique [0002] my country is the second largest corn producer in the world, with an annual output accounting for 20% of the world's total output. It is also a major corn consumer and plays a pivotal role in national food security. The input of water and fertilizer, especially nitrogen fertilizer, is an important factor for the continuous increase of corn yield. The plant type of corn is tall and needs more nitrogen. Insufficient nitrogen fertilizer will cause the lack of nitrogen nutrition in the growing period of corn, resulting in a decrease in yield; leading to a reduction in yield and nitrogen use efficiency. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01C21/00
Inventor 刘涛褚贵新唐诚
Owner SHIHEZI UNIVERSITY
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