How to manage Water and Fertilizer in Rice after Flood

What problems should be paid attention to in washing rice seedlings?

The paddy fields affected by the disaster should promptly remove stagnant water, straighten inverted seedlings, dredge ditches in time, and lower the groundwater level. If the loss of irrigation facilities is relatively heavy, emergency repairs should be organized in a timely manner. When the stagnant water in the paddy field retreats, the ditch should be opened to drain the soil water, and the water content in the field should be reduced as soon as possible, so that the floating mud formed by flooding can be gradually settled so as to promote the growth of new roots. For the fields that have been submerged for a long time, the overcast and rainy weather can drain water at one time, and in case of hot sun and high temperature, the upper part of the rice plant should be drained gradually, dehydration and air regulation at night, daily irrigation and night dew, so as to facilitate the restoration of rice growth.

Why should extra-root topdressing be emphasized in double-cropping early rice after waterlogging?

At present, double-cropping early rice has entered the late stage of grain filling and fruiting, and the physiological functions of leaves and roots are weak. coupled with the flooding of rice plants, the vegetative organs are damaged in varying degrees. The use of extra-root topdressing is beneficial for leaves to absorb nutrients quickly, maintain leaves with longer functional time, prevent premature senescence, increase seed setting rate and increase 1000-grain weight. Extra-root topdressing is generally sprayed with 150-200 grams of potassium dihydrogen phosphate per mu. If the leaf color is lighter, 500-800 grams of urea can be added. Combined with pest control, we can get twice the result with half the effort.

What problems should the field management pay attention to after the middle and late rice waterlogging?

During the period of rice flooding, the vegetative organs of rice plants are damaged to varying degrees, and the growth of roots, leaves and tillers after water is restored, which requires a lot of mineral nutrition, coupled with the loss of fertilizer in the original paddy field, so topdressing should be fast and the amount of fertilizer should be enough. in order to promote the growth of rice plants as soon as possible. For the production of middle and late rice after the disaster, it is necessary to carefully observe the growth process, appearance, leaf color and so on.

First, for the fields that have not yet entered the young panicle differentiation, panicle fertilizer should be applied in the fourth leaf, urea and potassium chloride each 6-8 kg per mu. Second, for the fields and three kinds of grain seedlings that have entered the young ear differentiation and the leaf color faded obviously and appeared bluish yellow, the strong grain fertilizer should be applied in time, and urea and potassium chloride should be applied each 3 kg per mu. Third, it is necessary to carry out extra-root topdressing after heading and flowering, generally using 50 kg 0.5% ml 1% urea and 0.2% Mel 0.3% potassium dihydrogen phosphate per mu for foliar spraying. Fourth, high-yield fields with luxuriant growth and dark green appearance of grain seedlings should not be fertilized, because excessive fertilizer absorption of grain seedlings will cause tissue softness, greed for green, susceptibility to diseases and insects and lodging, and will also lead to a reduction in yield. However, it is necessary to open ditches in time to drain stagnant water, carry out wet irrigation, reduce the field humidity of high-yield fields, and improve the stress resistance and yield of rice.

What diseases and insect pests are easy to occur in rice after waterlogging?

After the rice is flooded, the leaves are injured, the disease resistance of the plant is reduced, and the temperature and humidity in the field are suitable for the growth and spread of diseases and insect pests, which are easy to cause the occurrence of rice planthopper, rice leaf roller, rice stem borer, rice sheath blight, rice blast, rice bacterial leaf spot and so on.

How to prevent the epidemic of bacterial leaf spot and bacterial blight in rice?

In the early stage of the disease, 20% thiazole zinc suspension 100ml 125g / mu, or 20% thiazol copper suspension 100130g / mu, or 20% leaf tetrazole wettable powder 100ml 150g / mu can be selected.

How to control sheath blight of ratooning rice in the first season?

All fields with a disease cluster rate of 15% are listed as the target fields for spraying prevention and control. Spray the first medicine 7 days before the break and heading, and spray it again at the full heading stage. The medicament can choose 5% Jingangmycin water agent 200ml / mu, or 30% benzopropiconazole EC 15ml / mu, or 24% thiofuramide suspension 13m 23ml / mu, and spray 50ml 60kg of water.

How to improve the control effect of rice leaf roller?

First, it is necessary to grasp the period of prevention and control. It should be sprayed from the peak of egg hatching to the second instar larvae, and the effect of spraying in the evening is the best.

The second is to choose the right pesticide. For example, 20% chlorobenzamide suspension 10 ml / mu, or 15% indomethyl EC 12 Mel 16 ml / mu, or 40% propiophos EC 80 Mel 100 ml / mu, or 1.8% abamectin EC 16 Mel 30 ml / mu, pyrethroids pesticides are prohibited.

Third, a new type of plant protection machinery should be selected. The new application equipment can reduce running, emitting, dripping and leakage, and improve the prevention and control effect. Such as "Guardian" brand manual sprayer, atomizer.

The fourth is to use sufficient water. When spraying, it is necessary to add enough water, the water consumption of manual sprayer is at least 50 kg per mu, the water consumption of fog machine is not less than 25 kg per mu, and the water layer in the field should be maintained when spraying.