Is rice self-pollinating or cross-pollinating (the main pollination method of rice flowers)

The main pollination method of rice flowers

Rice is self-pollinating. They are hermaphroditic, and the pollen from the stamens is transferred to the pistils, which means that wild rice is pure rice.

However, Academician Yuan Longping discovered a natural hybrid rice on the farm, which means that there are individuals with sterile stamens in nature. Only in this way can the pollen from other stamens pollinate the pistil.

The rice we grow now is all self-pollinating . During pollination, the anthers on the stamens fall onto the female pollen , combine with the ovules in the female pollen's ovary, develop into embryos, and finally become the rice we eat.

Under normal circumstances, rice begins to bloom, pollinate and bear fruit after entering the flowering period, which takes about a month.

The growth process of rice

The growth process of rice can be generally divided into two stages: vegetative growth and reproductive growth. It has to go through seed soaking, germination, sowing, seedling stage, transplanting, greening stage, tillering stage, panicle differentiation stage, heading and flowering stage, grain filling stage, and maturity stage.

Seed Soaking

From early May to mid-May, air the seeds for three days before soaking. Airing can sterilize and activate the activity of seeds. After sun exposure, soak them in 1000 times diluted 50% carbendazim wettable powder. Generally, soak for 48 hours at 20 degrees and 24 hours at 30 degrees.

Germination

Take out the seeds that have absorbed enough water, put them in a snakeskin bag for germination. Generally, after 48 hours, all the seeds will break open and show white color.

sowing

Sow the germinated seeds into the seedling field. Keep the soil moist at this time. Two days later, the seedlings will break through the soil and the seedling field will turn green.

Seedling stage

One week after sowing, the seedlings will grow their first leaf; 10 days later, when the seedlings have one leaf and one heart, weaning fertilizer should be applied. 20 days later, when the seedlings have four leaves and one heart, tillering fertilizer should be applied. 30 days later, when the seedlings have six leaves and one heart, they can be transplanted to the field and "wedding fertilizer" should be applied.

Transplanting

In mid-June, the seedlings are transplanted and planted at a reasonable density. Then enough basic seedlings are planted to promote effective tillering and ensure high yield and effective ears. At this time, shallow water is mainly used to protect the seedlings in the field.

Green period

During transplanting, the root system is damaged by pulling out the seedlings, and it takes 5 to 7 days for the root system to sprout new roots and the aboveground part to resume growth. This period is called the greening period, during which the field should be kept deep watered and greening fertilizer should be applied.

Tillering stage

In mid-to-late June, rice enters the early tillering stage after turning green. In early July, rice enters the peak tillering stage. This period of time is about 10 days, which is called the effective tillering period.

In late July, effective tillering is basically completed. The tillers during this period cannot produce heading and fruit, which is called the ineffective tillering period. At this time, the field should be drained and sun-dried to control ineffective tillering. The ineffective tillering period is about 20 days.

Jointing and Booting Stage

The jointing and heading stage refers to the period from the beginning of panicle differentiation to the growth of panicles, which generally takes about a month. In early August, rice begins to joint and heading, transitioning from the vegetative growth period to the reproductive growth period. At this time, the field should maintain a shallow water layer.

Heading and flowering period

In early September, rice begins to head. Three to five days later, a large area of ​​rice begins to head. Seven days later, rice enters the early flowering stage. Three to five days later, rice enters the peak flowering stage. During this period, a shallow water layer should be maintained in the field.

Grouting and fruiting period

In mid-September, rice begins to fill with grain, and irrigation is required intermittently to maintain root vitality and water requirements during the filling period. In late September, the husk becomes hard and yellow, and the rice ears begin to droop.

Maturity

In early October, rice enters the maturity stage. At this time, the stalks are green, the seeds are yellow, the husks are hard and golden, and the grains are full, and it is time to harvest.