"summer fallow" meaning in English

{
  "forms": [
    {
      "form": "summer fallows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "summer fallow (plural summer fallows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "winter fallow"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Agriculture",
          "orig": "en:Agriculture",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "tags": [
            "verb"
          ],
          "word": "summer-fallow"
        }
      ],
      "glosses": [
        "Land uncropped and plowed, etc., during the summer, in order to pulverize the soil and kill the weeds."
      ],
      "id": "en-summer_fallow-en-noun-GI9x0KoW",
      "links": [
        [
          "pulverize",
          "pulverize"
        ]
      ],
      "synonyms": [
        {
          "word": "summer-fallow"
        }
      ]
    }
  ],
  "word": "summer fallow"
}

{
  "derived": [
    {
      "tags": [
        "verb"
      ],
      "word": "summer-fallow"
    }
  ],
  "forms": [
    {
      "form": "summer fallows",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "summer fallow (plural summer fallows)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "winter fallow"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Agriculture"
      ],
      "glosses": [
        "Land uncropped and plowed, etc., during the summer, in order to pulverize the soil and kill the weeds."
      ],
      "links": [
        [
          "pulverize",
          "pulverize"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "summer-fallow"
    }
  ],
  "word": "summer fallow"
}