Thailand Super Large Leaf is a fast-growing new variety introduced from Thailand in four seasons. It has the characteristics of heat resistance, cold resistance, pumping resistance, fast growth, and strong fragrance. Plant height 40-50 cm, 5 commercial plants weighing 400-500 grams, dark green leaves, white-green petiole, leaves and tender stems can be used for cold, raw, fried, pickled or seasoning soup Is the application technology of slow release fertilizer for medicinal food in rice seedling cultivation.

Rice long-acting slow (controlled) release fertilizer is a newly developed product of the Institute of Soil and Fertilizers, Guangdong Academy of Agricultural Sciences. It combines organic rice specificity of fertilizer and long-acting slow (controlled) release of nutrients to effectively solve rice cultivation. The problems of many times of conventional fertilization and heavy operation have realized that the rice needs only "one-time" fertilization to meet the nutritional requirements of the whole growth period, and has achieved the purpose of simple and efficient fertility increase and pollution-free. Meizhou began to introduce rice long-acting slow (controlled) release fertilizer in 2002 for experimental demonstration. The effect of increasing income and reducing expenditure was obvious. Now this technology is introduced as follows:

I. Application effect: The results of application demonstrations in various places in Meizhou show that the application of long-acting slow-release (controlled) release fertilizer not only increases and stabilizes yield, but also saves fertilizer and production costs, and improves rice production efficiency. The application of long-acting slow-release (controlled) fertilizer for rice increased the average yield by 21.76 kg / mu, an increase of 0.85-13.16%, increased income and saved 36.29 yuan / mu, and increased economic benefits by 5.88%. Slow (controlled) release of rice fertilizer, one base application meets the nutritional needs of a single crop of rice, simplifies rice fertilization technology, and achieves the effect of "saving labor, simplicity, high efficiency, increased yield, low cost, and low pollution".

1. Yield-increasing effect: In the field trials of 2002-2003, the slow (controlled) release fertilizer treatment area per acre increased the yield by 4.99% compared with the conventional fertilization treatment; in the field demonstration in 2003, the rice application of slow (controlled) release fertilizer treatment Yield of 482.08 kg per mu, an increase of 2.6% over conventional fertilization. From the experimental situation in 2002-2003, after applying slow (controlled) release fertilizer to rice, it increased the yield of rice by 4.1-55% kg per acre and increased the yield by 0.85-13.16%. This shows that compared with conventional fertilization, the application of slow (controlled) release fertilizer in rice has a slight increase in yield, but the increase in yield depends on the fertility of the field. The increase in yield in the field with better fertility is not large, and vice versa.

2. Analysis of agronomic traits. From the trials in 2002-2003, after the application of slow (controlled) fertilizer release to rice, the number of seedlings decreased by 14,700 per acre, a decrease of 4.04%. The survey results during the harvest period also showed that the slow (controlled) rice application After release of fertilizer, the effective panicles increased by 0.58 million per mu, an increase of 3.00%, and the rate of panicles increased by 3.9%, an increase of 7.33%. This indicates that after slow (controlled) release of fertilizer was applied to rice, the number of peak seedlings was reduced and the number of effective ears was increased, so the earing rate has been greatly improved. At the same time, the number of seeds per ear and the weight of thousand seeds also increased, of which the number of seeds per ear increased by 1.34 seeds, an increase of 1.14%, and the weight of thousand seeds increased by 0.20 grams, an increase of 0.86%. This shows that after slow (controlled) release of fertilizer is applied, rice can still release a certain proportion of nitrogen, phosphorus, and potassium in the medium term, which is conducive to increasing the number of solid grains and the seed setting rate, and at the same time, increasing the degree of fullness of the grains and increasing the thousand-grain weight.

3. Fertilization benefit analysis: From the experimental conditions of 2002-2003, after slow (controlled) release of fertilizer was applied to rice, the fertilization cost was slightly reduced compared to conventional fertilization, and the income per acre could increase by 36.29 yuan, and the economic benefit of fertilization was improved. 5.88%.

4. Field performance: From the experimental conditions in 2002-2003, after slow (controlled) release of fertilizer was applied to rice, it showed straight leaves, green leaf color, normal growth, no lack of fertilizer, strong growth and vigorous growth during the early growth stage; The leaf color is green in the middle period, and the color transition is smooth. The sufficient nutrient supply can still be maintained in the later stage of growth, which is one of the reasons for the application of long-term slow (controlled) release fertilizer to increase yield.

2. Application technology. Long-term slow-release (controlled) fertilizer release of rice, improved fertilization technology, changed the concept of traditional rice cultivation fertilizer application, and changed the traditional multiple-fertilization method to a "one-time" fertilization method, that is, just before the rice seedlings are thrown, Spread evenly at one time before the last raking. After the rice is thrown, keep shallow water in the field until the rice is harvested without applying any fertilizer. The general application rate is 30-40 kg / mu, which can be appropriately reduced or increased according to different types of soil and fertility conditions.

Third, matters needing attention

1. Rice long-acting slow (controlled) release fertilizer should be sealed and stored. Generally, it should be used immediately after opening the package to avoid direct sunlight, so as not to affect the coating effect of the composite coating material.

2. Rice long-acting slow (controlled) release fertilizer is used as a base fertilizer. Since fertilizer is applied only once during the whole growth period, it must be spread as far as possible to avoid affecting the uniformity of rice growth in the later stage. At the same time, due to the large amount of one-time application, it must be adjusted before fertilization. Field water, keep shallow water for three days after application, try not to drain and irrigate, so as not to affect the uniformity of fertilizer nutrients distribution in the field and reduce the effect of fertilizer nutrients.

3. The experimental demonstration shows that the long-acting slow (controlled) release fertilizer for rice is suitable for different soil types and rice varieties. The effect of "one-time" fertilizer application in rice loam soil and clay soil *, but in rice sandy soil fields It is advisable to apply it twice, namely as a base fertilizer and half each at the tillering stage of rice to improve the fertilizer effect.

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