Sweet potato, also known as sweet potato, is widely cultivated in China except for alpine regions. Not only that, the sweet potato planting area is second only to rice, wheat and corn. Sweet potato has the characteristics of high yield, strong regenerative capacity and resistance to thinness.
The growth process of sweet potato is divided into four stages: 1. The root growth stage. After the potato seedlings are planted, the roots of the various sections are rooted and the new shoots begin to grow. 2. Branching and potato stage. At this stage, the root system continued to develop, the axillary buds and the main spread were long, and the number of leaves increased significantly. In this period, small potato pieces began to form. 3. The stems and leaves are prolonged. Refers to stems and leaves from covering the ground to the highest peak of growth. During this period, stems and leaves grew rapidly, and the growth amount accounted for about 60% of the total growth period. The underground potato tubers increased weight significantly, also known as the same period of cassava. 4. Stem and leaf decline the potato block quickly and hypertrophy stage. It refers to the growth of stems and leaves from the Shenghua to the harvesting period, with the potato tubers as the center.
A large number of test results show that each kilogram of fresh potato requires 2 kg of nitrogen, 1 kg of phosphorus pentoxide, and 3.1 kg of potassium oxide. According to the fertility characteristics and fertilizer characteristics of sweet potato, the following principles should be mastered in sweet potato fertilization: mainly based on farmyard manure and supplemented by chemical fertilizer; base fertilizer is mainly used, supplemented by topdressing; Specifically divided into: 1. Base fertilizer. On the basis of the application of farmyard manure, the application of Tianji brand of NPK fertilizer is 30-35 kg per mu. 2. Topdressing (1) stimulating seedlings. In the hair roots slow seedling stage, the acres of chasing the ridge of nitrophosphate fertilizer 5 kg. (2) Strong plant fertilizer. In the prosperous period of stem and leaf growth, the stems and leaves can be long, early, ridged, and early potato, and the average cult is 10 to 15 kilograms of nitrophosphate.
The growth process of sweet potato is divided into four stages: 1. The root growth stage. After the potato seedlings are planted, the roots of the various sections are rooted and the new shoots begin to grow. 2. Branching and potato stage. At this stage, the root system continued to develop, the axillary buds and the main spread were long, and the number of leaves increased significantly. In this period, small potato pieces began to form. 3. The stems and leaves are prolonged. Refers to stems and leaves from covering the ground to the highest peak of growth. During this period, stems and leaves grew rapidly, and the growth amount accounted for about 60% of the total growth period. The underground potato tubers increased weight significantly, also known as the same period of cassava. 4. Stem and leaf decline the potato block quickly and hypertrophy stage. It refers to the growth of stems and leaves from the Shenghua to the harvesting period, with the potato tubers as the center.
A large number of test results show that each kilogram of fresh potato requires 2 kg of nitrogen, 1 kg of phosphorus pentoxide, and 3.1 kg of potassium oxide. According to the fertility characteristics and fertilizer characteristics of sweet potato, the following principles should be mastered in sweet potato fertilization: mainly based on farmyard manure and supplemented by chemical fertilizer; base fertilizer is mainly used, supplemented by topdressing; Specifically divided into: 1. Base fertilizer. On the basis of the application of farmyard manure, the application of Tianji brand of NPK fertilizer is 30-35 kg per mu. 2. Topdressing (1) stimulating seedlings. In the hair roots slow seedling stage, the acres of chasing the ridge of nitrophosphate fertilizer 5 kg. (2) Strong plant fertilizer. In the prosperous period of stem and leaf growth, the stems and leaves can be long, early, ridged, and early potato, and the average cult is 10 to 15 kilograms of nitrophosphate.
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