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The difference between early rice and flooded soil nutrients:
Paddy fields are isolated due to flooding, soil and air are isolated, oxygen cannot enter the cultivation layer, aerobic bacteria are suffocated, and anaerobic bacteria are active. Therefore, the tillage layer gradually becomes severely deficient in oxygen, forming a blue-gray reducing layer. On the contrary, the wet irrigated soil is still in contact with the air, oxygen is sufficient, the cultivation layer and the soil and soil layer are oxidized, and aerobic bacteria are active for most of the time. Therefore, flooding or water breakage has a significant impact on several important plant nutrient elements as well as rice growth and yield. Nitrogen in the flooded soil is dominated by NH'+, whereas in wet irrigated soil N3 is dominant. There was little difference in the alkali-hydrolyzable nitrogen content between early rice and flooded rice in the tillering and ripening stages. The difference in booting period is relatively large. In the middle growth period of rice, the soil moisture status will have some influence on the release of soil nitrogen. According to the analysis data of the soil moisture analyzer, it is more obvious that the soil fertility level is higher.
As we all know, the flooding conditions for rice cultivation are conducive to the release of phosphorus in the soil. There was no significant difference in soil available phosphorus content between drought-fed rice and flooded paddy-sown rice, and there were significant differences between booting and mature stages. The reason for this needs further study. Because the soil is not long-irrigated paddy soil, it does not possess some characteristics of paddy soil, but it is grown in dryland soil.
The trend of the change of available potassium in drought-cultivated rice and flooded soils is the same. However, the available potassium content of rice in all growth stages of rice was higher than that of flooded cultivation. The results showed that dry rice seedlings improved the permeability of soil and the soil was in an oxidized state, which promoted the release of potassium in the soil. Dry rice seedlings have improved the permeability of soil and the soil is in an oxidized state, which promotes the release of soil nutrients. Under the condition of high fertilization level, the peak period of rice uptake is more pronounced.
There was no significant difference in the concentration of three elements in different growth stages of rice drought-fed rice and flooded rice. The amount of nitrogen and potassium absorbed by rice plants forming a certain amount of economic output is somewhat different. The percentage of total nutrient uptake in rice at each growth stage is slightly different. The nitrogen utilization rate, soil residue and deficit loss of rice paddy and flooded cultivation are similar. There are large differences in the sources of nitrogen nutrition. Flooding planting nitrogen from soil is nearly twice as high as that of rice drought. Therefore, organic fertilizer should be applied to submerged planting and soil fertility should be cultivated. However, some nitrogen fertilizers should be added to dry rice.
During the rice harvest period, the flooding plantation had a higher nitrogen and phosphorus run rate than the dry rice plant and the potassium run rate was almost the same.
In a hydraulic press, a modest mechanical force (F1) is applied to a small area (A1). As the fluid is moved in one location, it inevitably moves elsewhere within that channel. Then a larger area (A2) generates a magnified mechanical force (F2). The force is transmitted via hydraulic pressure generated by the initial effort, F1.
Differences between Early Rice Seed and Flooded Soil Nutrients
With the development of national economic construction, the increase in industrial and agricultural production and urban living water consumption, the shortage of water resources severely limits the production of rice in the north, resulting in the difficulty of eating rice. The drought-fed rice is a kind of drought-resistance rice cultivation method in Beijing, Tianjin, Hebei and other provinces according to the physiological characteristics of rice can tolerate a certain degree of drought during the seedling stage, and uses the management measures of the post-drought water to adapt to the natural characteristics of the northern spring early summer. The expansion of rice production in the north of China has opened up a new way, adapting to the new situation of the current commercial production of grain and improving the food structure. Practice has proved that dry rice seedlings do not need water conservation and flooding, as long as the intermittent irrigation can meet the water demand of the plants. In general years, in addition to natural rainfall, only 300 to 400 square feet/mu of water need to be replenished, and the yield per mu can reach 300 to 400 kg. Compared with flooded cultivation, paddy rice planting can save irrigation water by 40 to 50%, and it can increase net income by about 100 yuan per mu compared with corn planted in the same period. Especially in low-lying areas, there is a great future for development. This article focuses on the issue of soil nutrients in dry soils of rice.
Application areas are almost limitless. Usually, a laboratory hydraulic press will be used to prepare samples for analysis by compressing them into pellets or thin films. The particles are forced together, creating a homogenous sample ideal for spectroscopic examination.