How to Achieve High Yield in the Late Growth Stage of Rice? A Detailed Explanation of the Latest Cultivation Key Points

The period from heading to maturity in rice is called the late growth stage of rice. The management tasks during this period: first, to control pests and diseases well; second, to prevent premature senescence of rice; third, to prevent rice from excessive vegetative growth and late maturity. In order to achieve these three goals, it is recommended that farmer friends do the following work well:

Pest and Disease Control

1. Diseases

The main disease requiring attention in the late growth stage of rice is rice blast. After rice heading, seize the opportunity to apply pesticide 2---3 times, with an interval of about 7 days. You can use about 100 grams of tricyclazole wettable powder per mu, mixed with 30 kg of water for foliar spraying.

2. Pests

The main pests in the late growth stage of rice include white-backed planthopper, brown planthopper, armyworm and rice leaf roller. All four of these pests have long-distance migratory and sudden outbreak characteristics, and timely control should be noted. You can choose the grenade insecticide series produced by Guangxi Jiuhe -- a dedicated insecticide for rice leaf roller mixed with a dedicated insecticide for rice planthopper, each at 30 ml per mu, mixed with 45----60 kg of water for foliar spraying. The control effect is especially excellent.

Reinforce the Field Ridges

Dredge drainage, lower the groundwater level, and enhance the vertical permeability of the soil. Through vertical permeation, harmful substances such as salts, alkalis and hydrogen sulfide in the soil are carried away, while oxygen dissolved in water is brought into the lower soil layer, enhancing root vitality.

Implement Shallow Water Irrigation

In the late grain-filling stage, implement intermittent irrigation with alternating wet and dry conditions. The water layer should be 2---3 cm. Wait for it to seep dry naturally until the field can be entered without sinking and the soil does not crack, then irrigate the next round of water. Master the water cutoff period well. The water cutoff period is generally about 40 days after full heading of rice, or 7---10 days before harvest. For rice fields with a high groundwater level and heavy salinity and alkalinity, water retention should be the main focus, and the water cutoff period should be appropriately postponed to prevent soil salt return and premature senescence of rice.

Topdressing Foliar Fertilizer and Plant Growth Regulators

After full heading of rice, it is not advisable to apply nitrogen fertilizer to the root zone. Instead, topdressing foliar fertilizer and plant growth regulators is an auxiliary measure to prevent premature senescence and excessive vegetative growth with late maturity in rice. Spraying foliar fertilizers such as rare earth potassium dihydrogen phosphate at the conventional rate can promote grain filling, promote early maturity and increase yield. Generally, 1---2 applications are sufficient. Due to the many rainy days this year, especially the continuous rainy and low-temperature weather during the rice heading period, rice grain filling is slow. For a small number of rice fields with a longer growth period and very late sowing and transplanting, in the early grain-filling stage of rice, you can spray 40% ethephon 400----800 times dilution mixed with Huaguo Doctor Guoneng multi-element. Ethephon has the effect of accelerating rice grain filling and advancing maturity. After applying ethephon, the nutrients in rice leaves are rapidly transferred to the panicle, thereby making the leaf color lighter and encouraging earlier yellowing. However, it should be noted that ethephon is only a plant growth regulator and does not increase yield for rice that can mature normally. Generally, rice fields should try not to use ethephon, especially rice sprayed with ethephon must not be retained for seed use.