Introduction: Corn sprinkler irrigation is difficult for general sprinkler irrigation equipment, mainly due to its height. However, using the "Rain Star" reel sprinkler irrigation machine for sprinkler irrigation does not have any problems. Take North China as an example to analyze the sprinkler irrigation technology for corn.

Irrigation needs to be determined based on the water demand, precipitation, and soil moisture content at each growth stage of the crop. For most regions of North China, the big bell stage of corn is the critical starting period for water demand, and the tasseling silk stage is the critical period for water demand. These two periods are during the rainy season and generally do not require irrigation. During the sowing and grouting periods, there is often less precipitation and irrigation is required.

The impact of sprinkler irrigation during the sowing and grouting periods on yield and the introduction of sprinkler irrigation methods are as follows:

1、 Spraying irrigation during seedling stage

1. The effect of sprinkler irrigation at seedling stage on yield The appropriate soil moisture, that is, the soil moisture content accounts for 70%~80% of the Field capacity, not only can ensure that maize can be sown at the right time to ensure the whole seedling, but also create conditions for the healthy growth of seedlings. The drought in early summer in North China, that is, the precipitation in June is less than 50 mm, and the drought frequency is 47%. Therefore, summer maize sowing often encounters insufficient moisture, which affects sowing and taking the whole seedlings, delaying sowing, and thus affecting the yield. According to experiments, if summer corn is sown one day per night during the appropriate sowing period, the yield per mu will be reduced by more than 10 kilograms. So in order to sow in a timely and early manner, irrigation should be carried out during sowing. In the past, after wheat harvest, if there was insufficient moisture content, flooding was carried out, which was long and uneven, often causing the corn to miss the suitable sowing time. By using sprinkler irrigation, the time is fast, uniform, and water-saving, and the terrain requirements are not strict, which can ensure the collection of all seedlings. Pre sowing sprinkler irrigation increases the emergence rate by 50% compared to non sprinkler irrigation, and can increase yield by about 30%.

2. The method of sprinkling irrigation at seedling stage is to measure the soil water content before sowing. When the water content accounts for less than 70% of the Field capacity, sprinkling irrigation is required. There are two methods:

(1) Pre sowing sprinkler irrigation: Start sprinkler irrigation immediately after the wheat harvest, and the amount of sprinkler irrigation should be determined based on the soil moisture at the time to ensure that seedlings can emerge. Generally, 30mm of sprinkler irrigation is equivalent to approximately 20 cubic meters of water per acre. You can also use the method of watering wheat yellow water before wheat harvest to increase soil moisture.

(2) Post sowing sprinkler irrigation: During the three summers, time is tight, and in order to improve the sowing progress, it is also possible to spray irrigation after sowing. But it is necessary to spray irrigation immediately after sowing, so as to avoid the phenomenon of early sowing but not early emergence, as well as large and small seedlings. Generally, the sprinkler irrigation time is 25mm, which is equivalent to approximately 17 cubic meters of water per acre. In actual production, due to the tight schedule of time, manpower, and material resources, reasonable arrangements should be made. Both methods can be used, one is spraying irrigation before sowing, and the other is spraying irrigation after sowing. This can improve the sowing progress and ensure full emergence of seedlings. Both of the above methods should pay attention to the uniformity of sprinkler irrigation, otherwise it will affect the harvesting of the entire seedling.

2、 Sprinkler irrigation during grouting period

1. The impact of sprinkler irrigation on the yield of maize in the filling period in North China was not watered in the filling period before, on the one hand, because of low yield and low density, on the other hand, there was more autumn rain. In recent years, corn production has been high, density has been high, and autumn rain has been scarce. Precipitation alone cannot meet the needs. The water demand for summer corn, which produces 500 kilograms per acre during the flowering and ripening period, is 223-256 millimeters, while the average value in Beijing during this period (from late August to the end of September) is only 85.8 millimeters. Combined with groundwater, it is far from enough to meet the needs, especially in autumn drought years, Generally, watering is required during the grouting period. The experiment showed that spraying 20mm during the grouting period increased the weight of 1000 grains by 22-46 grams and increased the yield by 40-80 kilograms. As the irrigation amount increases, its thousand grain weight and yield also increase correspondingly, but the increase amplitude is different. From 20mm to 30mm, the increase amplitude is relatively large, while from no irrigation to irrigation of 20mm and from 30mm to 40mm, the increase amplitude is not significant, so spraying 30mm is better.

2. Sprinkler irrigation method: In the middle and later stages of corn, the plants are tall and generally around 2 meters tall. Use the "Rain Star" reel type sprinkler irrigation machine for irrigation, and simply add an elevated position to the spray gun position to meet the sprinkler height requirements.