A reasonable amount of fertilizer refers to the amount of fertilizer that can be used to maximize production or economic benefits, and in this amount, the soil fertility can be continuously increased or at least maintained. According to this principle, the biggest fertilizer effect should be considered. The so-called maximum fertilizer effect is the amount of fertilizer that is used when the economic returns are maximized, and usually refers to the amount of fertilizer applied near the left of the highest point of the “production curveâ€. This needs to be done in a field trial. Some methods that do not require field experiments have been proposed, such as using the phosphate fertilizer index to determine the optimum amount of phosphate fertilizer. However, the field trials are still the most reliable method at present. Although the cycle is long and time-consuming, only a set of field trials can be planned in one area, and then the best amount, soil and crop traits obtained can be statistically processed. The interrelationships of dosage, soil properties, and crop characteristics (eg, variety, sowing date, etc.) may lead to a series of methods for determining the amount of use without having to conduct field trials each time. At the same time, the impact on soil fertility should also be considered to ensure that soil fertility does not decrease during this period. This aspect should pay attention to the consumption of soil nutrients by crops. When determining the amount of fertilizer, the balance of nutrients must be taken into consideration. 1. Organic Fertilizers: Organic fertilizers include manure and green manure, preferably applied before sowing so that they can be well decomposed and mineralized. In warm and humid areas, as time permits, it is better to turn in 20-30 days before planting, so that when the crop grows vigorously, there will be sufficient supply of nutrients. In northern China, organic fertilizers require more time to decompose and mineralize, but sometimes they cannot be applied on cornices. Whether in the South or North of China, organic fertilizers are usually piled up for a period of time in advance so that their nutrient release can be consistent with the crop's need for fertilizer. In fact, the timely application of organic fertilizers to meet the nutrient requirements of crops is difficult, and it is best to use chemical fertilizers, especially nitrogen fertilizers. 2. Chemical Fertilizers: (1) Nitrogen Fertilizer: Most crops require less nitrogen at the seedling stage, but the subsequent major growth stages often require high levels of nitrogen fertilizer. From the seedling stage to the main growth period, different crops are different. Because nitrogen fertilizer is easily lost, the loss mechanism is related to different soil properties. All these are the considerations for the reasonable application time of nitrogen fertilizers. In general, in areas with little rainfall, crops with short growing seasons can be fertilized at the time of sowing in order to save labor. Conversely, split applications should be considered. Of course, the maximum nutrient needs of crops should also be given due consideration and avoid the greatest loss. (2) Phosphorus fertilizer: In theory, due to the fixed effect of phosphate fertilizer and soil, it is usually desirable to apply base fertilizer once during sowing. However, in soils with low to moderate phosphorus holding capacity, it may be scattered in advance. For soils with moderate phosphorus content, phosphate fertilizers may be applied every 2 to 4 years to ensure that the soil phosphorus levels do not decrease. Soils with low phosphorus levels are generally applied centrally at the time of sowing. (3) Potassium Fertilizer: Potassium fertilizer should generally be applied as base fertilizer during sowing. Potassium is a kind of cation, and its movement in soil is not large (larger than that of phosphorous). Therefore, it takes a considerable time for potash fertilizer for top dressing to be possible. Movement to the densely rooted area. For crops with main roots, such as peanuts, rapeseed, etc., potash fertilizer can be applied early before planting. Of course, this depends on whether the actual conditions permit. The reason is that potassium can be distributed in deeper soil layers and distributed more uniformly throughout the soil layer. In general, phosphorus fertilizer and potassium fertilizer for the purpose of maintaining soil fertility can be applied at any time.
Foot of ningxia hong xingda incense Organic Apple fruit suborbicular, fruit surface color yellow green, most with orange chardonnay fruit surface, covered with bright red stripes, pulp yellow-white, succulent crisp, sweet, rich fragrance, quality first-class; The fruit has a sugar content of over 15%, more than 4% of the national average, and the flesh is tight and crisp and sweet, which is widely loved by consumers all over the world. There is a longer optimal consumption date than any other apple, not even refrigerated. It can be kept for 4 months at normal temperature. If refrigerated, Fuji can be kept for 5--7 months.
Altitude: high altitude area light, clean air, environment close to original condition, no industrial pollution. With an average elevation of 1160-2900m, the central health center has a strong uv light, which produces the natural pollution-free apple, which conforms to the concept of a modern green diet.
Temperature: moderate temperature can avoid the chance of fruit tree encountering disease. The average temperature in ningxia is 8.4 degrees Celsius, which has an important influence on the growth, development, yield and quality of apple. The piedmont apple is thriving in such a good environment.
Humidity environment: moderate amount of rainfall provides necessary conditions for apple's growth. The annual rainfall in the central health region is 186 millimeters. The fruit is slow to grow and the fruit is hard and hard, which fully guarantees the fruit's sugar content and the relatively average size of apples.
Sunshine condition: apple is the fruit tree, the central health area of the whole year is nearly 3,800 hours, is beneficial to the Apple Fruit coloring. The piedmont apples are red and bright.
Temperature difference factors: ambassador apple nighttime respiration weak temperature gap between day and night, consume less organic matter, the accumulation of organic matter during the day more, that apple store down a large number of glucose sugar candy, etc have better taste. The average diurnal temperature difference between apple and apple is 14 degrees centigrade, and the larger diurnal temperature difference ensures the sweet and delicious characteristics of the apple.
Other factors: frost can make apple blossom and fruit, which can cause frozen flower jelly, which is bad for apple's production. The piedmont apple has been kept at least 167 days without frost for the whole year, which minimizes the influence of apple on yield and quality.
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Ningxia hongxingda fruit industry , http://www.hxdfruit.com