Under the condition of good water and fertilizer, alfalfa can generally be cut 3-5 times a year, and the average yield of fresh alfalfa per mu is 4000-6000 kg, or 0.5-06 thousand kg, and the high yield can reach 8000kg. Among them, the first green cutting accounts for 40-50%, usually 3.73kg of fresh grass (if it is cut at the initial flowering stage, the moisture content is calculated as 77.5%) is sun-cured 1kg of hay (the moisture content is calculated as 16%). The first crop can produce 500kg hay. If it is calculated by cutting four crops, the annual output is calculated by 4500kg, and the average yield per crop is 1 125kg, or 302kg of hay.

P.S. How many kilograms of grass can dry one kilogram of hay.

The formula is: ﹙100 ﹚ ﹙100 ﹚ = ﹙100 ﹣/kloc- Such as 16.5% on average. When the water content of alfalfa grass is 82% in the vegetative growth period, it needs 4.64kg grass drying 1kg hay. When the water content in the early flowering stage is 80. 1%, it needs 4.2kg grass drying 1kg hay. At the early flowering stage, the moisture content is about 77.5%, usually 3.7 1kg fresh grass 1kg hay. When the water content is 74.7% at harvest in full bloom, 3.3kg of grass is needed. When the water content is 70.7% after flowering and harvesting, 2.85kg of grass is needed.

★ The growth period between germination and flowering of seeds is called "vegetative growth period", and the growth after flowering is called "reproductive growth period".

You can calculate it yourself according to the actual situation. The yield can be selected from representative plots with medium level. After mowing 1 m2, weigh it and multiply it by 667, which is the yield per mu.

The moisture content of hay can be estimated by visual inspection:

1. The water content is15 ~16%: when the grass bundle is rubbed by hand, it can rustle and make a creaking sound, but the grass with rich leaves and low leaves can't make a creaking sound. When the grass bundle is bent repeatedly, the stem breaks, the leaves are dry and curly, and the epidermis on the stem can hardly be peeled off with nails. This kind of grass is suitable for stacking and preservation.

2. The water content is16 ~18%: there is no cracking sound when rubbing the grass bundle, but only a rustling sound. When bending the grass bundle, only some plants are broken, and the upper stem can leave traces of bending, but the stem is constantly folded, the leaves are sometimes curled, and the upper leaves are soft, and the epidermis can hardly be peeled off with nails. This kind of grass is suitable for stacking and preservation.

3. The water content is19 ~ 20%: when the grass bundle is tightly packed, it can't produce crisp sound, but the coarse yellow grass has obvious cracking sound, and the hay is soft and easy to be twisted into a braid, which is repeatedly bent and kept; I can't squeeze out water when twisting the straw braid, but I feel wet. Gramineae grass epidermis can not be peeled off; The epidermis of the upper stem of leguminous grass can sometimes be peeled off. Danger of stacking and preservation.

4. The water content is 23 ~ 25%: there is no rustling sound when rubbing; When bending the straw bundle, water drops appear at the bending place, and it feels cold when you insert your hand into the haystack. Can't be stacked for preservation.