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A Method for Determining the Degree of Soil Dryness Based on Rice Leaf Color Ratio

A technology of ratio and degree, applied in soil material testing, color/spectral characteristic measurement, material inspection products, etc., can solve the mismatch of nitrogen status, the uncoordinated effects of water, nitrogen and yield, and the inconsistency between yield and water and nitrogen use efficiency Synergistic improvement and other issues to achieve the effect of synergistic improvement of nitrogen fertilizer use efficiency, improvement of irrigation water productivity, and synergistic improvement of water use efficiency

Active Publication Date: 2022-06-24
YANGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention proposes a method for determining the degree of dryness of the soil according to the rice leaf color ratio, by using the leaf color ratio of the 3rd fully expanded leaf and the 2nd fully expanded leaf on the top of the rice stem to determine the degree of dryness of the soil during rice tillering. stage, jointing stage, panicle development stage, heading flowering stage, pre-filling stage, mid-filling stage, and post-filling stage to determine the soil water potential index suitable for soil dryness in water-saving irrigation, so as to guide irrigation, which can solve the problem of water supply and rice plant nitrogen. The situation does not match, the water, nitrogen and yield effects are not synergistic, and the yield and water and nitrogen use efficiency cannot be improved synergistically

Method used

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  • A Method for Determining the Degree of Soil Dryness Based on Rice Leaf Color Ratio
  • A Method for Determining the Degree of Soil Dryness Based on Rice Leaf Color Ratio
  • A Method for Determining the Degree of Soil Dryness Based on Rice Leaf Color Ratio

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Embodiment approach

[0060] A soil moisture tensiometer was installed in the field 1 day before or on the day of rice transplanting. During installation, drill a hole with a diameter equivalent to the soil moisture tension meter clay head to a depth of 20cm from the ground, and insert the soil moisture tension meter vertically, so that the upper part of the clay head (5cm in length) is 15cm away from the ground, and the lower part is 15cm away from the ground. 20cm from the ground, make the clay head and the tensiometer tube buried in the soil in close contact with the soil, and then compact the surrounding soil (refer to the product manual for use). The reading values ​​on the table above the soil water tension meter were observed at the tillering stage, the jointing stage, the young ear development stage, the heading and flowering stage, the pre-filling stage, the mid-filling stage, and the later stage of grain-filling. For 1 to 6 days after rice transplanting, a shallow water layer of 1 cm to 2...

Embodiment

[0119] 1. Overview of Cultivation in Experimental Fields

[0120] Experiments were set up at the Yangzhou University Experimental Farm (Yangzhou, Jiangsu) in 2018 and 2019. The previous crop of the experimental site was wheat, the soil texture was sandy loam, the organic matter content of the tillage layer was 2.19%, the available nitrogen was 102 mg / kg, the available phosphorus was 33.5 mg / kg, and the available potassium was 62.4 mg / kg. The tested varieties were Huaidao No. 5 (conventional japonica rice) and Yangdao No. 6 (conventional indica rice), and the seeds were purchased from Yangzhou Seed Company and were sown on May 22. Produced by the company), the seedlings were raised in the seedling tray, and on June 19 (the seedling age was 18 days and the leaf age was 3.4), it was simulated by hand and machine. The application of urea (46% nitrogen content) in the whole growth period is equivalent to 200kg / hm for pure nitrogen Huaidao No. 5 2 , Yangdao No. 6 is 180kg / hm 2 , ...

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Abstract

A method for determining the degree of dryness of soil based on the rice leaf color ratio belongs to the field of agricultural technology. The invention is based on the quantification of soil moisture, the leaf color ratio of the third fully expanded leaf and the second fully expanded leaf on the upper part of the rice stem, and yield synergy and high efficiency. During the tillering stage, jointing stage, panicle development stage, pre-filling stage, mid-filling stage, and post-filling stage of rice, the appropriate soil dryness degree for water-saving irrigation is determined according to the leaf color ratio, so as to guide irrigation and realize rice yield and water use. Synergistic improvements in efficiency and nitrogen use efficiency. Compared with the conventional irrigation method, the rice yield, irrigation water productivity and nitrogen grain utilization rate can be increased by 10.41% to 11.07% and 44.6% to 49.3% and 10.63% to 12.10%.

Description

technical field [0001] The invention belongs to the technical field of agriculture, and relates to a method for determining the degree of soil dryness according to the leaf color ratio of rice, in particular to a method for water management after rice transplanting, so as to synergistically couple the effects of water, nitrogen and yield , a method to achieve synergistic improvement of rice yield, water use efficiency and nitrogen fertilizer use efficiency. Background technique [0002] Global agriculture in the 21st century faces two major challenges: one is to continuously increase food production to meet the needs of population growth, and the other is to cope with the dwindling water resources while increasing food production. Rice is one of the most important food crops in the world, providing 35% to 60% of the dietary calories for about 3 billion people. Continuously increasing the yield per unit area has always been the eternal theme of rice production. On the other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25G01N33/24
Inventor 杨建昌沈艳王志琴张伟杨
Owner YANGZHOU UNIV