How to manage the fertilizer amount and timing for direct-seeded rice?

Direct-seeded rice is a new type of rice cultivation technique, and there are many points to note when using it, so what about the fertilizer amount and timing for direct-seeded rice?

1. What is direct-seeded rice

Direct-seeded rice is a cultivation method in which the seeds are sown directly into the field without raising seedlings or transplanting.

The advantages of direct-seeded rice are: it can save a large amount of labor, ease the contradiction of seasonal labor shortages, and so on. It is of great significance for achieving lighter, more specialized and larger-scale rice production, and has broad prospects for promotion.

The disadvantages of direct-seeded rice are: compared with transplanted rice, direct-seeded rice has three major problems: difficulty in achieving a full stand of seedlings, severe weed damage, and susceptibility to lodging.

2. Fertilizer amount and timing for direct-seeded rice

1. The fertilization time for direct-seeded rice is generally divided into three periods: early, middle and late, and the fertilizer amount is 10-15 kg per mu;

2. In the early period (from transplanting to the end of tillering), apply more fertilizer to promote early growth of the rice seedlings;

3. In the middle period (pollen formation stage), apply less fertilizer to prevent the production of ineffective tillers;

4. In the late period (from heading to maturity), carry out reasonable topdressing according to the growth conditions of the rice.

The nitrogen, phosphorus and potassium requirement ratio for direct-seeded rice is 1:0.5:1.3. A field with a yield of 500 kg per mu requires about 10-15 kg of nitrogen, 5-7 kg of phosphorus pentoxide, and 13-18 kg of potassium oxide. For fertilizer selection, choose high-quality urea, diammonium phosphate and superphosphate, and potassium sulfate, potassium chloride or rice-specific compound fertilizer can also be used.

For the fertilizer amount at each stage, the base fertilizer applies about half of the nitrogen fertilizer and more than half of the phosphorus and potassium fertilizers. The principle for using tillering fertilizer is to apply it as early as possible. The tillering fertilizer is mainly quick-acting nitrogen fertilizer, applying about one quarter of the nitrogen fertilizer; affordable and widely available urea can meet the requirement. The ear fertilizer is applied about fifteen days before heading, with an application amount of about one quarter of the total nitrogen fertilizer, and the remaining potassium and phosphorus fertilizers are applied all at once.