How to ensure another wheat harvest?Henan province has released technical guidelines on measuring soil moisture and irrigation for wheat in spring 2022

2022-05-21 0 By

Big river network news (reporter Wang Jing) at present, the “spring” is over, in order to further strengthen the spring wheat moisture management, guiding farmers in quantity in seedlings for irrigation water science, to ensure that this year’s wheat again it was a very good, recently, the province soil fertilizer station issued by the henan province in 2022 spring wheat irrigation quantity measurement technology guidance “(hereinafter referred to as” guidelines “).In January, the temperature in most parts of the province was slightly higher, the precipitation was more, and soil moisture was abundant. Two large-scale rain and snow weather in January effectively supplemented soil moisture, which laid a good foundation for the safe overwintering and the growth of wheat in the green period.According to the results of 132 soil moisture monitoring sites (artificial/automatic) in The province on February 7, the relative water content of 0cm-20cm soil was 55%-110%, with an average of 82.8%, of which 85% were more than 60%.The relative water content of 20cm-40cm soil was 45%-107%, with an average of 81.85%, and 84% of the points were greater than 60%.In addition, according to the forecast of the meteorological department in February, the meteorological conditions are generally favorable for wheat green growth, and the soil moisture content in most areas of our province is still suitable.According to the guidelines, the water requirement of wheat increases after the turning green stage, the peak water requirement is from jointing stage to flowering stage, and the critical water requirement is from booting stage.Combined with the soil characteristics, when the relative water content of 0cm-20cm soil is lower than 60% at greening stage, lower than 70% at jointing and booting stage, and lower than 65% at heading and flowering stage, timely appropriate supplementary irrigation should be carried out to ensure the water demand for normal growth of wheat.General three types of wheat fields in green to rise period, in the temperature is not less than 3℃ irrigation;The first and second seedling wheat fields are irrigated at jointing stage.At present, soil moisture is abundant in most areas of the province. Considering the local actual situation, the frequency and amount of irrigation can be reduced as appropriate.How should irrigation be divided by region?Spring irrigation should focus on wheat moisture, seedling and water conditions, and focus on “saving”, so as to reduce the amount of groundwater taken out.Spring irrigation should make full use of surface water and stored water, and focus on “saving” to improve the utilization rate of natural precipitation.Central and eastern Henan are middle and high wheat producing areas, some areas lack irrigation conditions, spring irrigation should be wide open water, mainly “saving, reducing”, water saving irrigation due to soil moisture and seedling.The south Of Henan province is a middle and low wheat producing area, so spring irrigation should make full use of surface water, mainly “reduce”, because of soil moisture and seedling irrigation can be appropriately reduced.It is understood that most wheat fields in my province belong to well irrigation area or canal irrigation area, each district combines the characteristics of water source, can take pipe irrigation, drip irrigation, micro-sprinkling irrigation, sprinkling irrigation measures, reduce the amount of irrigation.Temperature instability, is important to note that the spring wheat jointing stage – booting stage pollen, should pay close attention to the weather forecast, when temperatures dropped sharply, but in the day the temperature is not lower than 3 ℃ when proper amount of m3 (20 ~ 30 m3 advisable) to infuse water, in order to increase arable layer soil heat reservoir, and to prevent the temperature fell sharply, wheat suffered from late frost freezing injury prevention.Irrigation should be small water irrigation, ensure that the surface of the field does not accumulate water.Irrigation after the timely ploughing, loose soil, conducive to moisture conservation.