☰ Contents · Technology

Potato, grain, melons and fertilisers

Lessons 96–99 · 4 lessons · Sh. Sharipov, N. Muslimov, O. Tolipov, Q. Abdullayeva, O. Qo‘ysinov, V. Sattorov, S. Ahmadaliyev, M. Mo‘minova. Mehnat ta’limi (Labour Education / Technology), Grade 5. Sharq Publishing, Tashkent, 2015
96

Potato-growing technology and process

Textbook: pp. 197–198
GoalKnow the potato’s structure, content and growing technology (crop rotation, fertilising).
New words
tuber · tugunakstarch · kraxmalcrop rotation · almashlab ekishprevious crop (predecessor) · o‘tmishdosh
Explanation

The potato is a valuable food crop: it contains about 20 percent starch, 2 percent protein, mineral salts and vitamins C, B1, B2 and B6. One plant grows 3–6 stems, 50–80 cm high. The fruit is a juicy, two-celled berry with small seeds. If agrotechnical work is done on time, 200–250 centners per hectare or more can be harvested. In Uzbekistan mountain and foothill areas and river-bank soils suit potatoes best: they are rich in organic fertiliser and warm less. Potatoes are grown in rotation: they do well after cabbage, cucumbers, melons, root crops and legumes; late potatoes are planted in fields freed of vegetables, cereals and maize. Nitrogen strengthens stem growth, and locally potatoes need more nitrogen and phosphorus; organic and mineral fertilisers together work well. Safety: potato tubers that have turned green and the berries can be poisonous, do not eat them; peel and cut potatoes with an adult.

Worked examples
At 220 centners per hectare, 2 hectares give 220 × 2 = 440 centners.
100 g of potato has about 20 g starch; 500 g has 100 g.
Class activity

Plant observation: with an adult look at a sprouted potato kept in a damp, dark place and count the eyes on the tuber. Do not eat it; if green, throw it away.

Practice
1
How much starch does a potato contain?
2
Which areas suit potatoes?
3
Which are good previous crops?
4
Why is green potato not eaten?