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不少地区及科研单位,在判别间作套种与单作的增减产时,把各作物的实收产量混加,这是极不准确的,因为各种作物所含的能量不同。判别间作套种与单作的增减产,可利用土地当量。如两种作物间套种,产量分m_1,m_2,则其土地当量T=m_1/m_1+m_2/m_2,若T>1,即表示间套种比单作增产,T愈大,则增产愈大,若T<1,即减产。
In many areas and scientific research units, it is extremely inaccurate to add up the actual production of crops for intercropping and single-cropping in discriminating between crops. This is extremely inaccurate because different crops contain different amounts of energy. Intercropping intercropping and single crop increase and decrease, can use the land equivalent. If intercropping between crops, the yield is m_1, m_2, then the land equivalent is T = m_1 / m_1 + m_2 / m_2. If T> 1, If T <1, that is, cut.