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Introduction to the Characteristics of the Rice Variety K You 926
The hybrid rice K You 926 was developed in 1993 by the Rice and Sorghum Research Institute of the Sichuan Academy of Agricultural Sciences by crossing K17A (already identified) bred by the institute with Luhui 926. In 1995, it was jointly introduced to our city by the Chongqing Agricultural Technology Extension Station and the Chongqing Seed Station. In the three years 1996, 1998, and 1999, the average yield in the mid-season rice plus ratoon rice variety trials was 672.53 Kg per mu, a 3.36% increase over the control Shanyou 63. From 1995 to 1999, in 1
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Symptom Identification and Control Methods of Rice Dwarf Disease
The symptoms are mainly distributed in the southern rice-growing areas. Also known as rice common dwarf disease, common dwarf, green dwarf, etc. After rice is infected from the seedling stage to the tillering stage, the plant becomes dwarfed, tillering increases, leaves are dark green and stiff, and in the later growth stage the diseased rice cannot head or set grain. Diseased leaf symptoms manifest as two types. In the white-spot type, dashed-line-like yellowish-white dotted streak spots parallel to the leaf veins appear on the leaves or leaf sheaths, most obvious at the base. The new leaves above the first diseased leaf all show dotted streaks, while the older leaves below generally do not. In the twisted type, under insufficient light conditions, the heart leaf emerges twisted
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Eight Measures for Safe Rice Seed Use Explained in Detail
1. Select varieties rationally. Rice blast is the main disease affecting harvest, and the resistance differences among varieties are very obvious; choosing varieties with strong resistance is one of the most effective preventive measures. In old rice blast areas and shaded cold-waterlogged fields, first, when purchasing seeds, carefully understand the resistance of the variety; second, new varieties should only be promoted after small-scale trial planting; third, use imported Fuji No. 1 for prevention at the early stage of disease onset and during the booting and heading stages. In mountainous areas with high humidity, for hybrid late rice it is not advisable to choose two-line hybrid late rice combinations, to prevent damage from rice false smut.
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Key Management Techniques for Rice at the Booting Stage in August
I. Field Management at the Booting Stage After good early vegetative growth, rice enters the reproductive growth stage of the middle and late periods. Strengthening water and fertilizer management at this stage is very important for high yields. Apply panicle fertilizer judiciously, depending on the field growth of the rice: for plots with too many stems per mu and dark green leaf color, do not apply; for plots with insufficient stems per mu and yellow leaf color, apply fertilizer, which can produce a clear yield increase. 1. Applying booting fertilizer: around August 5, for plots that did not receive early panicle fertilizer (mid-to-late July) and whose leaves have turned yellow at this time, apply 5-7 jin of urea per mu.
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What are the management measures for rice during the jointing and panicle elongation stage?
Currently, rice growth across the city has successively entered the jointing and panicle elongation stage, an important period of transition from vegetative growth to reproductive growth and a critical period that determines yield. Doing a good job of field management in the middle and late stages of rice is crucial for ensuring sufficient panicles, striving for large panicles, shaping a high-yield plant type, and building a good foundation for high yield. I. Seedling growth characteristics According to a survey on July 21, the average leaf age of machine-transplanted rice was 12.31 leaves, 0.49 leaves more than the same period last year; the average leaf age of direct-seeded rice was 10.31 leaves, 0.56 leaves more than the same period last year; the total number of stems and tillers was 38.63 for machine-transplanted rice
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Management Measures and Technical Points for Rice during the Jointing and Panicle Elongation Stage
The jointing and panicle elongation stage refers to the period from jointing and the beginning of young panicle differentiation to just before heading, generally 25-36 days for middle-season rice. 1. Growth and development characteristics and growth appearance during the jointing and panicle elongation stage (1) Growth and development characteristics During this period, on the one hand, stem elongation is the center, completing the growth of the last few leaves and root system and other vegetative organs; on the other hand, reproductive growth centered on young panicle differentiation takes place. During this period some tillers gradually die, and the total number of stems and tillers declines compared with the earlier stage, so it is an important period for preserving tillers and increasing panicles. From
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The correct method for broadcasting compound fertilizer during the rice stem elongation stage
During the rice stem elongation stage, topdressing is generally carried out 1 to 2 times. In previous years we used urea, but this year we switched to a high-tower granulated fertilizer. This is a compound fertilizer with high nitrogen and low phosphorus and potassium. The fertilizer granules are round and smooth on the outside, with holes inside, and have a relatively low specific gravity. Before fertilizing, we first drained the flooded water, then broadcast the compound fertilizer granules on the soil surface, and immediately let water back into the field. After the water layer was full, we found that some fertilizer granules appeared on the water surface. These floating granules were blown to one side by the wind, and some stayed in the sheltered corners.
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Management Techniques for Rice at the Jointing and Booting Stage
Management at the jointing and booting stage: When 50% of the plants in the field have the main tiller elongated by 1-2 cm and the shape of the main tiller becomes rounded, it is the jointing stage. When 50% of the flag leaves have fully emerged from the leaf sheath, it is the booting stage. This period is when rice needs the most water in its entire life cycle. If the water is drained for a long time, it will affect the formation of the panicle, resulting in small panicles and many empty grains. However, deep water flooding should also be avoided; instead, irrigate frequently with shallow water and expose the field appropriately to promote root growth, achieving deep roots and lush leaves, and striving for large panicles and more grains.
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Identification and Control Methods for the White-backed Planthopper on Rice
Hosts include rice, wild rice, corn, barley, wheat, sugarcane, sorghum, barnyard grass, and Kentucky bluegrass. The damage characteristics are the same as those of the brown planthopper. Morphological features: The macropterous male is 3.2-3.8mm long, pale yellow, with dark brown spots. The top of the head protrudes forward; on the outer side of the lateral ridges of the pronotum and mesonotum, behind the compound eyes, there is a crescent-shaped dark brown spot; the lateral areas of the mesonotum are dark brown with a yellow longitudinal band in the middle; the forewings are semi-transparent with brownish halo spots at the tips; the wing veins, face, thorax, and ventral surface of the abdomen are dark brown. The macropterous female is 4-4
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Methods and Technical Key Points for Controlling the White-Backed Planthopper in Rice
Damage symptoms: Adults and nymphs gather in colonies at the base of rice plants and pierce and suck the sap, causing the leaf tips of rice leaves to lose green and turn yellow, and in severe cases the whole plant withers and dies. Damage during the heading stage can also cause difficulty in heading, blighted panicles, or browning of the panicles, along with many empty grains and other damage symptoms. Morphological characteristics: Adults have two forms, the long-winged type and the short-winged type. The long-winged adult is 4-5 mm long, grayish yellow, with a rather narrow vertex projecting in front of the compound eyes; the face has 3 raised longitudinal ridges, with the ridges light in color and the grooves dark, black and white sharply distinct; in the center of the scutellum on the thoracic dorsum grows a pentagonal white or bluish-white spot; in females the
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