CN107466645A - It is applicable northern area and raises the cultural method that oily dual-purpose rape a kind of two is received - Google Patents

Abstract

The cultivation method provided by the present invention is applicable to a kind of two-harvesting cultivation method of oil-feeding and dual-purpose rapeseed in the northern region, irrigate 15cm in late October and apply 30% nitrogen fertilizer, cultivated land, the next year according to the seed-to-fertilizer ratio of 1:10 and the sowing rate of 15kg/hm ² , Row spacing 30cm, depth 3cm sowing irrigation; within 3 days of sowing, spray with 50% acetochlor mixed with water 450kg; at the seedling stage, bud shoot, and flowering stage, water the surface 8cm to stabilize the seedlings ^; Periodically apply 90kg/hm ² of urea; the height of stubble left after the first harvest is 20cm; then the second crop of weeding, irrigation, fertilization and other operations are carried out; the second crop of forage grass is harvested and silaged in the first and middle ten days of October. The invention effectively utilizes light, heat and water resources, reduces water and soil loss, increases the total yield of seeds and forage grass, enables the northern region to realize two harvests a year, does not affect grain production, and avoids seasonal abandonment of cultivated land Phenomenon, effective use of cultivated land resources.

Description

A two-harvesting cultivation method suitable for both feeding oil and dual-purpose rapeseed in the northern region

technical field

The invention relates to the technical field of crop cultivation, in particular to a cultivation method of forage rapeseed.

Background technique

The lack of winter forage grass in Xinjiang's breeding industry is in conflict with agricultural land, which is one of the bottleneck problems that have plagued the development of animal husbandry in agricultural areas for a long time.

Rapeseed has a long history of cultivation, and China and India are the oldest countries in the world to cultivate rapeseed. India is the most planted rapeseed in the world, followed by China, and Canada ranks third. The northern small rapeseed is native to the west of China, and is distributed in Northwest China, North China, Inner Mongolia and the provinces (regions) of the Yangtze River Basin. The cultivation is the most prosperous in Changhua County, Taiwan, China, and there are also many cultivations in Taichung, Miaoli, Chiayi, Yunlin, and Nantou. It is native to Europe and Central Asia. Rapeseed in China is mainly distributed in the Yangtze River Basin and is a biennial crop. They are sown in autumn and harvested in May of the following year. Annual rape sown in spring and harvested in autumn is mainly distributed in southwest Xinjiang, Gansu, Qinghai and Inner Mongolia.

Feed rapeseed is a variety of rapeseed that pursues the output of stems and leaves. Its stems and leaves are larger than ordinary rapeseed. It is suitable for silage. It is rich in crude protein and crude fiber. It has good palatability for feeding livestock, high feed intake rate, and a large number of livestock. There is no phenomenon of bloating and diarrhea after eating. In addition, forage rape is a double-low variety with low erucic acid and glucosinolate content. Its seeds are safe and reliable for oil extraction and stem feeding. The large amount of organic acids secreted by the roots can also dissolve insoluble nutrients in the soil and enhance soil microbial activity. , is a good predecessor of other crops. However, due to the influence of climate conditions, farming system and farmers' habits, forage rape is generally used for spring sowing or autumn multiple cropping, and there is no related report of two harvests, especially in Xinjiang, where the winter is long and the temperature rises late. In this area, most crops are harvested once a year, and rapeseed has always been harvested once a year.

Contents of the invention

Aiming at the current technical situation of lack of forage grass in winter and forage rape once a year, the present invention proposes a cultivation method suitable for two harvests of forage and oil rapeseed in the northern region, which provides two crops of spring sowing oil-feeding and dual-purpose rapeseed a year. The technical solution for harvesting is sowing in spring, harvesting seeds and stalks for forage in summer, and harvesting stalks for forage in autumn, which does not affect food production, avoids the phenomenon of seasonal abandonment of cultivated land, effectively utilizes cultivated land resources, and realizes the supply of forage grass It is of great significance to win-win with soil fertilization.

The present invention provides a kind of two-harvesting cultivation method applicable to oil-feeding and dual-purpose rapeseed in the northern region, comprising the following steps:

Moisture conservation irrigation before sowing was carried out in late October of the previous year, and the irrigation depth was 15cm-25cm; when the soil moisture infiltrated and evaporated until the machinery could enter the field, 30% nitrogen fertilizer was applied as the base fertilizer, and then mechanical plowing was carried out to cultivate the land. Depth ≥ 25cm; before spring sowing, rake the ground and level the ground until it is ready for sowing; mix the forage rape seeds and seed fertilizer according to the weight ratio of 1:10, the sowing rate is 15kg/hm ² , the row spacing is 30cm, and the sowing depth is 3cm; The long-term irrigation method is ground border irrigation or drip irrigation. The drip irrigation belt can be laid at the same time as the sowing and lightly covered with soil. The dripper spacing is 20cm, and the dripper flow rate is 3.2L/h; within 3 days after sowing, use 50% acetochlor 1500mL/hm ² -7500mL/hm ² , mixed with 450kg of water and sprayed on the soil in the field to kill weeds; watered at the seedling stage, sprouting stage and flowering stage respectively, to moisten the ground surface by 5cm-8cm; the total amount of irrigation in the ground irrigation method was 1050m ³ /hm ² - 135Om ³ /hm ² ; the total amount of irrigation under the drip irrigation method is 1050m ³ /hm ² -1275m ³ /hm ² ; if the plant spacing is less than 3cm, the seedlings should be fixed at the cotyledon stage, and the seedlings should be fixed at the stage of a true leaf, and the seedlings should be fixed every 3cm-5cm One seedling; topdressing at the 5-leaf stage and budding stage respectively, topdressing urea 75kg/hm ² -90kg/hm ² at the 5-leaf stage; topdressing urea 75kg/hm ² -90kg/hm ² at the budding stage; The seeds and forage grass are harvested mechanically or manually, and the stubble height is 15-20cm; then the second crop of rapeseed is irrigated, field weed control, fertilization, etc. are managed; drip irrigation pipes can be reused without re-laying; the second crop of rapeseed is harvested and fed Grass can be harvested in early or mid-October after the first frost, harvested manually or mechanically, leaving 2cm-8cm of stubble on the ground; feed rapeseed and straw according to the weight ratio: straw = 2:3, mix them and put them into the cellar for silage.

In the present invention, the moisture conservation irrigation method in autumn is ground border irrigation.

In the present invention, the method of fertilization is manual spreading or mechanical strip application.

In the present invention, it is required not to be heavy and not to leak when preparing the ground, and to have no stubble on the ground from the edge to the corner.

In the present invention, the seed fertilizer is double superphosphate.

In the present invention, the soil compacted before seedling setting and the soil with higher groundwater level will be intertilled, the intertillage depth is 12cm-15cm, the intertillage width is 5cm-10cm, and the cultivator is equipped with a soil crushing device.

In the present invention, the forage rapeseed is Huayouza 62, which is a "double-low" cabbage-type spring-sown rapeseed variety that is both used for feeding and oil. The plant type is relatively large, with an average plant height of more than 150 cm, a long growth period, cold resistance, and frost resistance. Suitable for silage.

In the present invention, 2l00m ³ -3000m ³ of water is used for irrigation per hectare.

In the present invention, straw is wheat straw or corn straw.

In the present invention, seeds and forage grass are harvested in the first crop, and forage grass is harvested in the second crop.

Beneficial effects of the present invention:

The dual-harvest cultivation method of oilseed rape described in the present invention effectively solves the phenomenon of "more than enough time for planting one season and insufficient time for second season" in northern production, resulting in serious waste of light, heat and water resources, and causing water and soil pollution. Compared with the traditional method of one harvest, the total yield of seeds and forage grass has been significantly increased, more forage grass has been obtained than traditional edible rapeseed, and more seeds have been obtained than traditional forage rapeseed, making Xinjiang region also realize a Two harvests per year have greatly alleviated the lack of forage grass in winter in pastoral areas in Xinjiang, without affecting grain production, avoiding the phenomenon of seasonal abandonment of cultivated land, and effectively utilizing cultivated land resources. Significance.

detailed description

The specific embodiment of the present invention is described in further detail below, but method of the present invention is not limited to following examples.

Three test fields were selected in Aksu, Yili and Urumqi suburbs of Xinjiang, each with an area of 1 hectare. The seed (Hua Youza 62) of means of production, TSP, urea, and herbicide acetochlor all adopt commercially available products, and cultivation method of the present invention, traditional edible oil rape and forage rape are all used in these three The experiment points were implemented, and the forage yield and seed yield of rapeseed planted by the following examples and the traditional method were counted in the three experiment points.

Example 1: A two-harvesting cultivation method of oilseed rape

The invention provides a kind of two-harvest cultivation method suitable for spring sowing feed rapeseed in the northern region. In the last ten days of October of the previous year, moisture conservation irrigation was carried out before sowing, and the irrigation depth was 15cm-25cm; When entering the field work, first apply 30% nitrogen fertilizer as the base fertilizer, and then carry out mechanical plowing, the depth of the plowed land is ≥ 25cm; before spring sowing, harrow the land and level the land to the state to be sown; feed rapeseed in a weight ratio of 1:10 to the fertilizer Mix well with seed fertilizer, sow at a rate of 15kg/hm ² , sow at a row spacing of 30cm; sow at a depth of 3cm; the irrigation method during the growth period is ground border irrigation or drip irrigation, and the drip irrigation belt can be laid at the same time as the sowing and lightly covered with soil, 2 rows per tube, dripper Spacing 20cm, dripper flow rate 3.2L/h; within 3 days after sowing, spray 50% acetochlor 1500mL/hm ² -7500mL/hm ² , mixed with water 450kg on the field soil to kill weeds; , Bud sprouts, and flowering stage, wetting the surface 5cm to 8cm; the total irrigation amount under the surface irrigation method is 1050m ³ /hm ² -135Om ³ /hm ² ; the total irrigation amount under the drip irrigation method is 1050m ³ /hm ² -1275m ³ /hm ² ; if the distance between plants is less than 3cm, the seedlings should be fixed at the cotyledon stage, and the seedlings should be finished at the time of one true leaf, and the seedlings should be fixed every 3cm-5cm; topdressing at the 5-leaf stage and the budding stage, and topdressing urea 75kg/ hm ² -90kg/hm ² ; topdressing urea 75kg/hm ² -90kg/hm ² at the budding stage; after the seeds are ripe, harvest the seeds and the first crop of forage grass mechanically or manually, with a stubble height of 15-20cm; proceed immediately The irrigation of the second crop of rapeseed, field weed control, fertilization and other management; the drip irrigation pipes can be reused without re-laying; the second harvest of forage grass can be harvested manually or in the middle of October after the first frost. Leave 2cm-8cm of stubble on the ground; feed rapeseed and straw according to the weight ratio of feed rape: straw=2:3, mix them and put them into the cellar for silage.

In the present invention, the soil moisture conservation irrigation method is ground border irrigation.

In the present invention, the method of fertilization is mechanical strip application.

In the present invention, it is required not to be heavy and not to leak when preparing the ground, and to have no stubble on the ground from the edge to the corner.

In the present invention, the seed fertilizer is double superphosphate.

In the present invention, the soil compacted before seedling setting and the soil with higher groundwater level will be intertilled, the intertillage depth is 15cm, the intertillage width is 10cm, and the cultivator is equipped with a soil crushing device.

In the present invention, the forage rapeseed is Huayouza 62, which is a "double-low" spring-sown rapeseed variety of the "double low" type used for both feeding and oil. Frost resistant, suitable for silage.

In the present invention, the moisture conservation irrigation uses 3000m ³ water per hectare.

In the present invention, straw is wheat straw.

In the present invention, seeds and forage grass are harvested in the first crop, and forage grass is harvested in the second crop.

Example 2: A two-harvesting cultivation method of oilseed rape

Adopt a kind of two-harvesting cultivation method test of following spring sowing fodder rapeseed of the present invention:

Moisture conservation irrigation before sowing was carried out in late October of the previous year; the irrigation method was border irrigation, the irrigation depth was 15cm, and the water used per hectare was 2l00m ³ , without serial irrigation or running water; when the soil moisture infiltrated and evaporated until the machine could enter the field, First apply 30% nitrogen fertilizer as the base manure, then carry out mechanical plowing, the depth of the plowed land is 15cm, harrow the land before spring sowing, flat land to the state to be sown; mix the feed rapeseed and the seed manure evenly by the weight ratio of the manure ratio of 1:10, Feed rapeseeds are made of Huayouza 62, and the seed fertilizer is heavy superphosphate. The seeding rate is 15kg/hm ² , and the row spacing is 30cm. Carry out at the same time and lightly cover with soil, one tube with 2 rows, the distance between drippers is 20cm, and the flow rate of drippers is 3.2L/h; within 3 days after sowing, that is, before the emergence of forage rapeseed, use 50% acetochlor 1500mL/hm ² , mix with water 450kg is sprayed on the field soil to kill weeds; combined with the growth period, watering is carried out at the seedling stage, budding stage, and flowering stage respectively, and the ground surface is moistened by 5cm; the total irrigation amount under the ground irrigation method is 1050m ³ /hm ² ; the total irrigation amount under the drip irrigation method is 1050m ³ /hm ² ; the soil with compacted soil and higher groundwater level should be intertilled before seedling setting, with a depth of 12cm, a width of 5cm, and a soil crushing device behind the cultivator; if the plant spacing is less than 3cm, the seedlings should be settled at the cotyledon stage, and one true leaf At the end of seedling setting, one seedling per 3cm is required for seedling setting; topdressing is carried out at the 5-leaf stage and the budding stage respectively, and 75kg/hm ² of urea is topdressed at the 5-leaf stage ^; After maturity, mechanically or manually harvest the seeds and the first crop of forage grass, and the stubble height is 15cm-20cm; then carry out the growth period management of the second crop of forage rape, such as weeding, irrigation, fertilization, etc. The drip irrigation pipe can be reused without re-use. Laying; the second crop of forage rapeseed can be harvested in early or mid-October after the first frost, harvested manually or mechanically, leaving 2cm of stubble on the ground. Forage rapeseed and corn stalks are mixed in a weight ratio of feed rapeseed: straw = 2:3, and put into the cellar for silage.

Embodiment three: a kind of two-harvesting cultivation method of forage oil double-purpose rapeseed

Adopt a kind of two-harvesting cultivation method test of following spring sowing fodder rapeseed of the present invention:

Moisture conservation irrigation before sowing was carried out in late October of the previous year; the irrigation method was border irrigation, the irrigation depth was 20cm, and the water used per hectare was 2500m ³ . First apply 30% nitrogen fertilizer as basal manure, then carry out mechanical plowing, 30cm of plowed land depth, harrow the ground before spring sowing, flat land to the state to be sown; feed rapeseed (Huayouza 62) Mix well with the seed fertilizer, sow with a wheat seeder, the sowing rate is 15kg/hm ² , and the row spacing is 30cm; the irrigation method during the growth period is ground border irrigation or drip irrigation, and the drip irrigation belt can be laid at the same time as the sowing and lightly covered with soil. The dripper spacing is 20cm, and the dripper flow rate is 3.2L/h. Within 3 days after sowing, that is, before the emergence of forage rapeseed, spray 50% acetochlor 5000mL/hm ² , mixed with 450kg water, on the field soil to kill weeds; combined with the growth period, irrigate at the seedling stage, budding stage, and flowering stage respectively , wet the ground surface 6cm; the total irrigation amount under the ground irrigation method is 1250m ³ /hm ² ; the total irrigation amount under the drip irrigation method is 1200m ³ /hm ² ; 8cm, with a soil crushing device behind the cultivator; if the distance between plants is less than 3cm, the seedlings should be fixed at the cotyledon stage, and the seedlings should be fixed when there is one true leaf. The seedlings should be fixed every 3cm-5cm. Topdressing at the 5-leaf stage and budding stage respectively, topdressing urea 80kg/hm ² at the 5-leaf stage; topdressing urea 80kg/hm ² at the bolting stage; 15cm-20cm, and then carry out the growth period management of the second crop of forage rape, such as weeding, irrigation, and fertilization. The drip irrigation pipes can be reused without re-laying; the second crop of forage can be harvested in mid-October after the first frost. Harvested by hand, leaving 4cm of stubble on the ground. Rapeseed rape and corn stalks are mixed in a weight ratio of rapeseed:straw=2:3, and put into the cellar for silage.

Embodiment 4: A kind of two-harvesting cultivation method of forage oil dual-purpose rapeseed

A two-harvesting cultivation method test of the following spring sowing forage rapeseed was adopted:

Moisture conservation irrigation before sowing was carried out in late October of the previous year; the irrigation method is drip irrigation, the irrigation depth is 22cm, and the water consumption per hectare is 2500m ³ , without serial irrigation or running water. When the soil moisture infiltrates and evaporates until the machine can enter the field, first apply 30% nitrogen fertilizer as the base fertilizer, and then carry out mechanical plowing to a depth of 35 cm; before spring sowing, harrow the land and level the land until it is ready for sowing. Mix the forage rape seeds and seed fertilizer according to the weight ratio of 1:10, the seed fertilizer is heavy superphosphate, and the forage rapeseed is Huayouza 62; the seeding rate is 15kg/hm ² , and the row spacing is 30cm; the growth period The irrigation method is ground border irrigation or drip irrigation. The drip irrigation belt can be laid at the same time as the sowing and lightly covered with soil. One tube has 2 rows, the distance between the drippers is 20cm, and the flow rate of the drippers is 3.2L/h; within 3 days after sowing, that is, before the emergence of forage rape , with 50% acetochlor 2500mL/hm ² , mixed with 450kg water and sprayed on the field soil to kill weeds; combined with the growth period, irrigate at the seedling stage, bud shoot, and flowering stage respectively, and wet the surface 7cm; the total amount of irrigation under the ground irrigation method 1150m ³ /hm ² ; the total irrigation amount under the drip irrigation method is 1175m ³ /hm ² ; the soil compacted before seedling setting and the soil with high groundwater level should be intertilled, and intertilled after emergence, the intertillage depth is 14cm, the intertillage width is 9cm, and there is broken soil behind the cultivator Device; if the distance between plants is less than 3cm, the seedlings will be fixed at the cotyledon stage, and the seedlings will be finished when there is a true leaf. The seedlings should be set every 4cm. Topdressing at the 5-leaf stage and bolting stage respectively, topdressing urea 85kg/hm ² at the 5-leaf stage; topdressing urea 85kg/hm ² at the bolting stage; after the seeds mature, harvest the seeds and the first crop of forage grass mechanically, and the stubble height is 18cm , and then carry out the growth period management of the second crop of forage rape, such as weeding, irrigation, and fertilization. The drip irrigation pipes can be reused without re-laying; the second crop of forage can be harvested in early October after the first frost, and mechanically harvested. Leave 7cm of stubble on the ground; feed rapeseed and wheat straw in a weight ratio of 2:3, mix them and put them into the cellar for silage.

Embodiment 5: Yield evaluation of a kind of double-harvesting cultivation method of forage oil dual-purpose rapeseed of the present invention

Choose three test points in Xinjiang area, carry out a kind of two-harvesting test of spring sowing forage rape according to cultivation method described in the present invention, choose above-mentioned embodiment one to embodiment four to provide cultivation method statistics harvest seed output and harvest forage grass output and take a The traditional rapeseed planting method of planting and harvesting was compared, among which the first comparative test was to plant forage rapeseed by the traditional method, and the second comparative test was to plant edible rapeseed by the traditional method.

Table 1: Harvested seed yield (kg/ha)

test point 1 2 3 Embodiment one 3900 4200 4425 Embodiment two 3925 4220 4450 Embodiment Three 3900 4250 4470 Embodiment Four 3980 4200 4450 Comparative test one 2050 2140 2250 Comparative test two 3400 3500 3550

Table 2: Harvested forage yield (kg/ha)

test point 1 2 3 Embodiment one 63000 67500 72000 Embodiment two 63500 67800 72500 Embodiment Three 63000 67900 73000 Embodiment Four 64000 67500 72500 Comparative test one 55000 56500 57000 Comparative test two 28000 29500 30000

In above-mentioned experiment, described forage grass is the fresh grass weight before silage, can find out from above-mentioned test, a kind of two-harvesting cultivation method of spring sowing oil-feeding double-purpose rapeseed described in the present invention, and traditional method a kind of one-harvest phase. It not only increased the yield per mu of oil and fodder respectively, but also significantly increased the total yield of seeds and forage grass, obtained more forage grass than traditional edible rapeseed, and obtained more seeds than traditional forage rapeseed, which made the Xinjiang region also realize The two harvests a year not only alleviated the shortage of forage grass in winter in pastoral areas in Xinjiang, but also did not affect grain production, avoided the phenomenon of seasonal abandonment of cultivated land, and effectively used cultivated land resources, which has the potential to achieve a win-win situation in the supply of forage grass and soil fertilization. Significance.

As mentioned above, the present invention can be better realized. The above-mentioned embodiment is only a description of the preferred implementation of the present invention, and does not limit the scope of the present invention. Various modifications and improvements made by technicians to the technical solution of the present invention shall fall within the scope of protection determined by the present invention.

Claims (10)

1. A kind of two-harvesting cultivation method suitable for oil-feeding rapeseed in the northern region is characterized in that, in the last ten days of October of the previous year, moisture conservation irrigation was carried out before sowing, and the depth of irrigation was 15cm-25cm, and the soil moisture was infiltrated and evaporated. When the machine can enter the field operation, first apply 30% nitrogen fertilizer as the base fertilizer, then carry out mechanical plowing to a depth of ≥25cm, rake the land before spring sowing, and flatten the land to the state to be sown; Rapeseed seeds and seed fertilizer are mixed evenly. The seed fertilizer is granular heavy superphosphate. The seeding rate is 15kg/hm ² , the row spacing is 30cm, and the seeding depth is 3cm. The irrigation method during the growth period is ground border irrigation or drip irrigation. And lightly cover with soil, one tube with 2 rows, dripper spacing 20cm, dripper flow rate 3.2L/h; within 3 days after sowing, use 50% acetochlor 1500mL/hm ² -7500mL/hm ² , add water 450kg to the field Spray the soil to kill weeds; water at the seedling stage, budding stage, and flowering stage respectively, and moisten the ground surface by 5cm to 8cm; the total amount of irrigation under the surface irrigation method is 1050m ³ /hm ² -135Om ³ /hm ² ; the total amount of irrigation under the drip irrigation method 1050m ³ /hm ² -1275m ³ /hm ² ; if the plant spacing is less than 3cm, the seedlings should be fixed at the cotyledon stage, and the seedlings should be finished when there is one true leaf, and the seedlings should be set every 3cm-5cm; at the 5-leaf stage and budding stage respectively topdressing; topdressing urea 75kg/hm 2 -90kg/hm ² before irrigation at the 5-leaf stage; topdressing urea 75kg/hm ² -90kg/hm ² at the bud stage ^; For one crop of forage grass, the stubble height is 15-20cm; then the second crop of rape can be irrigated, field weed control, fertilization and other managements are carried out; the second crop of forage grass can be harvested in the first and middle October after the first frost, manually or Harvest mechanically, and leave 2cm-8cm stubble on the ground; feed rapeseed and straw in a weight ratio: straw = 2:3, mix them and put them into the cellar for silage. 2. A kind of two-harvesting cultivation method applicable to oilseed rape in the north as claimed in claim 1, characterized in that, the moisture conservation irrigation method in autumn is ground border irrigation. 3. A kind of cultivation method applicable to two harvests of oilseed rape in northern areas as claimed in claim 1, characterized in that, the fertilization method is artificial spreading or mechanical strip application. 4. A kind of two-harvesting cultivation method suitable for oil-feeding and dual-purpose rapeseed in the northern region as claimed in claim 1, characterized in that, when the soil is prepared, it is required to be neither heavy nor leaky, and there is no residue on the ground . 5. A kind of cultivation method applicable to two harvests of oilseed rape in the northern region as claimed in claim 1, characterized in that, the seed fertilizer is double superphosphate. 6. A kind of cultivation method applicable to two harvests of oilseed rape in the northern area as claimed in claim 1, it is characterized in that, before the seedlings are settled, the soil with high groundwater level and ground compaction will be intertilled, and after emergence, intertillage, intertillage The depth is 12cm-15cm, the intertillage width is 5cm-10cm, and there is a soil crushing device behind the cultivator. 7 . A kind of cultivation method suitable for two harvests of oilseed rape in the northern region as claimed in claim 1 , characterized in that, the forage rapeseed variety is Huayouza 62. 8 . 8. A cultivation method suitable for two harvests of oilseed rape in the northern region as claimed in claim 1, characterized in that the water used for irrigation per hectare with moisture conservation in autumn is 2100m ³ -3000m ³ . 9. A cultivation method suitable for two harvests of oilseed rape in northern regions as claimed in claim 1, characterized in that said straw is wheat straw or corn straw. 10. A kind of two-harvesting cultivation method applicable to oilseed rape in the northern region as claimed in claim 1, characterized in that, the two harvests are the first harvest of seeds and forage grass, and the second harvest of forage grass.