orfour, these perennial crops are yielding in much reduced ways. therefore, your argument about low inputs but high yield, it simply doesn t apply to your own proposals. so, there s only one which has been fully commercialised so far, and that s a rice variety called pr23, which is being widely grown now in southern china. and so far there have been six harvests and the yields are the same, notjust as they began, but the same as the annual rice with which it s competing. now, you can t keep these crops in the ground forever. eventually they will have to be replaced. but by switching from annual grain crops to perennial grain crops, it means much less ploughing, much less establishment of the plants, probably much less fertiliser use, water use and a whole load of other environmental aspects. moreover, because these plants have deeper roots and tougher above ground structures, because they can grow from one year to the next, they re likely to be far more
annually planted and reared. all of the evidence i ve seen suggests that by year three orfour, these perennial crops are yielding in much reduced ways. therefore, your argument about low inputs but high yield, it simply doesn t apply to your own proposals. so, there s only one which has been fully commercialised so far, and that s a rice variety called pr23, which is being widely grown now in southern china. and so far there have been six harvests and the yields are the same, notjust as they began, but the same as the annual rice with which it s competing. now, you can t keep these crops in the ground forever. eventually they will have to be replaced. but by switching from annual grain crops to perennial grain crops, it means much less ploughing, much less establishment of the plants, probably much less fertiliser use, water use and a whole load of other environmental aspects. moreover, because these plants have deeper roots and tougher above ground structures,
about low inputs but high yield, it simply doesn t apply to your own proposals. so, there s only one which has been fully commercialised so far, and that s a rice variety called pr23, which is being widely grown now in southern china. and so far there have been six harvests and the yields are the same, notjust as they began, but the same as the annual rice with which it s competing. now, you can t keep these crops in the ground forever. eventually they will have to be replaced. but by switching from annual grain crops to perennial grain crops, it means much less ploughing, much less establishment of the plants, probably much less fertiliser use, water use and a whole load of other environmental aspects. moreover, because these plants have deeper roots and tougher above ground structures, because they can grow from one year to the next, they re likely to be far more resilient to environmental shocks. pretty much a decade ago, you wrote a book, feral, which recommended the large
all of the evidence i ve seen suggests that by year three orfour, these perennial crops are yielding in much reduced ways, therefore, your argument about low inputs but high yield, it simply doesn t apply to your own proposals. so, there s only one which has been fully commercialised so far, and that s a rice variety called pr23, which is being widely grown now in southern china. and so far there have been six harvests and the yields are the same, notjust as they began, but the same as the annual rice with which it s competing. now, you can t keep these crops in the ground forever. eventually they will have to be replaced. but by switching from annual grain crops to perennial grain crops, it means much less ploughing, much less establishment of the plants, probably much less fertiliser use, water use and a whole load of other environmental aspects. moreover, because these plants have deeper roots and tougher above ground structures,
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