The present disclosure discloses a method for producing raw cotton of machine-harvested long-staple cotton with a modal length of greater than or equal to 35 mm, including the steps: planting sea-island long-staple cotton and machining seed cotton, wherein planting the sea-island long-staple cotton includes preparation before machine harvesting, defoliation and ripening, choosing a cotton variety, etc.; and machining the seed cotton includes preparation before seed cotton ginning, mechanical separation of cotton seeds and raw cotton, and finishing the separated raw cotton. Raw cotton fibers obtained by the method of the present disclosure have main quality indexes that: a fiber length is 36.5-38.4 mm, a specific strength is 42.3-46.1 cN/tex, a uniformity is 86.2-87.0%, a foreign-fiber content is 0.2-0.4 g/t, and an impurity content is 2.6-3.4%. According to the method, not only can impurities and foreign fibers be effectively removed, but also mechanical damage to the raw cotton of the machine-harvested long-staple cotton with the modal length of greater than or equal to 35 mm is relatively small.

The present disclosure discloses a method for producing raw cotton of machine-harvested long-staple cotton with a modal length of greater than or equal to 35 mm, including the steps: planting sea-island long-staple cotton and machining seed cotton, wherein planting the sea-island long-staple cotton includes preparation before machine harvesting, defoliation and ripening, choosing a cotton variety, etc.; and machining the seed cotton includes preparation before seed cotton ginning, mechanical separation of cotton seeds and raw cotton, and finishing the separated raw cotton. Raw cotton fibers obtained by the method of the present disclosure have main quality indexes that: a fiber length is 36.5-38.4 mm, a specific strength is 42.3-46.1 cN/tex, a uniformity is 86.2-87.0%, a foreign-fiber content is 0.2-0.4 g/t, and an impurity content is 2.6-3.4%. According to the method, not only can impurities and foreign fibers be effectively removed, but also mechanical damage to the raw cotton of the machine-harvested long-staple cotton with the modal length of greater than or equal to 35 mm is relatively small.

A self-propelled harvesting machine for harvesting a crop field has a ground drive including multiple working units, a control system and a sensor system. The sensor system periodically emits transmitted pulses of electromagnetic transmission beams in at least one transmission direction onto the crop field and the transmitted pulses are reflected on the crop field and are received as echo pulses by the sensor system. For at least one portion of the transmitted pulses, different partial beams of a single transmission beam are reflected by plants of the crop field lying one behind the other with a time offset, so the particular resultant echo pulse is composed of time-offset partial echo pulses. The control system determines a value for the crop density on the basis of a time correlation within the resultant echo pulse, and controls the ground drive and/or the working units on the basis of the determined crop density.

The present disclosure discloses a method for producing raw cotton of machine-harvested long-staple cotton with a modal length of greater than or equal to 35 mm, including the steps: planting sea-island long-staple cotton and machining seed cotton, wherein planting the sea-island long-staple cotton includes preparation before machine harvesting, defoliation and ripening, choosing a cotton variety, etc.; and machining the seed cotton includes preparation before seed cotton ginning, mechanical separation of cotton seeds and raw cotton, and finishing the separated raw cotton. Raw cotton fibers obtained by the method of the present disclosure have main quality indexes that: a fiber length is 36.5-38.4 mm, a specific strength is 42.3-46.1 cN/tex, a uniformity is 86.2-87.0%, a foreign-fiber content is 0.2-0.4 g/t, and an impurity content is 2.6-3.4%. According to the method, not only can impurities and foreign fibers be effectively removed, but also mechanical damage to the raw cotton of the machine-harvested long-staple cotton with the modal length of greater than or equal to 35 mm is relatively small.

The present disclosure discloses a method for producing raw cotton of machine-harvested long-staple cotton with a modal length of greater than or equal to 35 mm, including the steps: planting sea-island long-staple cotton and machining seed cotton, wherein planting the sea-island long-staple cotton includes preparation before machine harvesting, defoliation and ripening, choosing a cotton variety, etc.; and machining the seed cotton includes preparation before seed cotton ginning, mechanical separation of cotton seeds and raw cotton, and finishing the separated raw cotton. Raw cotton fibers obtained by the method of the present disclosure have main quality indexes that: a fiber length is 36.5-38.4 mm, a specific strength is 42.3-46.1 cN/tex, a uniformity is 86.2-87.0%, a foreign-fiber content is 0.2-0.4 g/t, and an impurity content is 2.6-3.4%. According to the method, not only can impurities and foreign fibers be effectively removed, but also mechanical damage to the raw cotton of the machine-harvested long-staple cotton with the modal length of greater than or equal to 35 mm is relatively small.

A detasseling apparatus includes a chassis having a head mounted to the chassis. The head supports a plurality of row units, each of the row units having an independently adjustable vertical position. Each row unit is independently vertically adjustable. Each row unit includes a puller or cutter, a height adjustment assembly for independently adjusting vertical position of the detasseling assembly to maintain the puller or cutter at a predetermined height relative to seed corn plants being engaged, and an optical sensing assembly. The optical sensing assembly includes a first photoelectric sensor at a first sensor height and a second photoelectric sensor at a second sensor height, the first sensor height being above the second sensor height. A processor receives and stores detasseling data related to detasseling including corn height, depth of cut, height after cutting. The information may be shown on displays to the operator, stored on board the detasseler and/or transmitted to a central control center.

A detasseling apparatus includes a chassis having a head mounted to the chassis. The head supports a plurality of row units, each of the row units having an independently adjustable vertical position. Each row unit is independently vertically adjustable. Each row unit includes a puller or cutter, a height adjustment assembly for independently adjusting vertical position of the detasseling assembly to maintain the puller or cutter at a predetermined height relative to seed corn plants being engaged, and an optical sensing assembly. The optical sensing assembly includes a first photoelectric sensor at a first sensor height and a second photoelectric sensor at a second sensor height, the first sensor height being above the second sensor height. A processor receives and stores detasseling data related to detasseling including corn height, depth of cut, height after cutting. The information may be shown on displays to the operator, stored on board the detasseler and/or transmitted to a central control center.